diff --git a/radio/src/boards/generic_stm32/bl_keys.cpp b/radio/src/boards/generic_stm32/bl_keys.cpp
index 413494a71..2e1a89066 100644
--- a/radio/src/boards/generic_stm32/bl_keys.cpp
+++ b/radio/src/boards/generic_stm32/bl_keys.cpp
@@ -6,6 +6,7 @@
 bool boardBLStartCondition()
 {
   // Trims combo activated
+  pollKeys();
   bool result = (readTrims() == BOOTLOADER_KEYS);
 #if defined(SECONDARY_BOOTLOADER_KEYS)
   result |= (readTrims() == SECONDARY_BOOTLOADER_KEYS);
diff --git a/radio/src/boards/generic_stm32/inputs.cpp b/radio/src/boards/generic_stm32/inputs.cpp
index 80856a0b0..993c756c7 100644
--- a/radio/src/boards/generic_stm32/inputs.cpp
+++ b/radio/src/boards/generic_stm32/inputs.cpp
@@ -34,6 +34,10 @@ __weak void keysInit()
   _init_trims();
 }
 
+__weak void pollKeys()
+{
+}
+
 __weak uint32_t readKeys()
 {
   return _read_keys();
diff --git a/radio/src/boards/rm-h750/bsp_io.cpp b/radio/src/boards/rm-h750/bsp_io.cpp
index a6b21c5b9..c1e59fdc0 100644
--- a/radio/src/boards/rm-h750/bsp_io.cpp
+++ b/radio/src/boards/rm-h750/bsp_io.cpp
@@ -38,6 +38,7 @@
 #include "debug.h"
 
 extern const stm32_switch_t* boardGetSwitchDef(uint8_t idx);
+extern bool suspendI2CTasks;
 
 struct bsp_io_expander {
     pca95xx_t exp;
@@ -108,6 +109,9 @@ static void _poll_switches(void *param1, uint32_t trigger_source)
     timer_reset(&_poll_timer);
   }
 
+  // Suspend hardware reads when required
+  if (suspendI2CTasks) return;
+
   _read_io_expander(&_io_switches);
   _read_io_expander(&_io_fs_switches);
 }
diff --git a/radio/src/bootloader/boot_menu.cpp b/radio/src/bootloader/boot_menu.cpp
index 1d067df23..74896b5a4 100644
--- a/radio/src/bootloader/boot_menu.cpp
+++ b/radio/src/bootloader/boot_menu.cpp
@@ -41,6 +41,8 @@
   #define SEL_CLEAR_FLASH_STORAGE_MENU_LEN 2
 #endif
 
+bool suspendI2CTasks = false;
+
 void pollInputs()
 {
   keysPollingCycle();
@@ -109,6 +111,7 @@ void bootloaderMenu()
         if (usbPlugged()) {
           state = ST_USB;
 #if !defined(SIMU)
+          suspendI2CTasks = true;
           usbStart();
 #endif
         }
@@ -119,6 +122,7 @@ void bootloaderMenu()
           vpos = 0;
 #if !defined(SIMU)
           usbStop();
+          suspendI2CTasks = false;
 #endif
           state = ST_START;
         }
diff --git a/radio/src/bootloader/boot_uf2.cpp b/radio/src/bootloader/boot_uf2.cpp
index 9b4eab203..e8283d9c0 100644
--- a/radio/src/bootloader/boot_uf2.cpp
+++ b/radio/src/bootloader/boot_uf2.cpp
@@ -34,6 +34,8 @@
 
 #define FRAME_INTERVAL_MS 20
 
+bool suspendI2CTasks = false;
+
 void bootloaderUF2()
 {
   BootloaderState state = ST_START;
@@ -71,6 +73,7 @@ void bootloaderUF2()
         if (usbPlugged()) {
           state = ST_USB;
 #if !defined(SIMU)
+          suspendI2CTasks = true;
           usbStart();
 #endif
         } else if (pwrOffPressed()) {
@@ -83,6 +86,8 @@ void bootloaderUF2()
         if (usbPlugged() == 0) {
 #if !defined(SIMU)
           usbStop();
+          suspendI2CTasks = false;
+
 #endif
           state = (state == ST_FLASH_DONE) ? ST_REBOOT : ST_START;
         } else {
diff --git a/radio/src/edgetx.cpp b/radio/src/edgetx.cpp
index 9c1e6c766..f7e451f6d 100644
--- a/radio/src/edgetx.cpp
+++ b/radio/src/edgetx.cpp
@@ -104,6 +104,7 @@ uint8_t latencyToggleSwitch = 0;
 #endif
 
 volatile uint8_t rtc_count = 0;
+bool suspendI2CTasks = false;
 
 #if defined(DEBUG_LATENCY)
 void toggleLatencySwitch()
@@ -1089,6 +1090,7 @@ void edgeTxClose(uint8_t shutdown)
   TRACE("edgeTxClose");
 
   watchdogSuspend(2000/*20s*/);
+  suspendI2CTasks = true;
 
   if (shutdown) {
     pulsesStop();
@@ -1140,6 +1142,7 @@ void edgeTxResume()
 {
   TRACE("edgeTxResume");
 
+  suspendI2CTasks = false;
   if (!sdMounted()) sdInit();
 
   luaInitMainState();
diff --git a/radio/src/hal/key_driver.h b/radio/src/hal/key_driver.h
index 933fbd081..0919f2570 100644
--- a/radio/src/hal/key_driver.h
+++ b/radio/src/hal/key_driver.h
@@ -51,6 +51,11 @@ enum EnumKeys {
   MAX_KEYS
 };
 
+// When port entender is used, readKeys should only return the cached key values
+// read key from port extender will only come from pollKeys
+// Which is called by the timer task
+void pollKeys();
+
 // returns a bit field with each key set as (1 << KEY_xxx)
 uint32_t readKeys();
 
diff --git a/radio/src/keys.cpp b/radio/src/keys.cpp
index 1230aec05..af4a93f90 100644
--- a/radio/src/keys.cpp
+++ b/radio/src/keys.cpp
@@ -476,6 +476,7 @@ uint16_t keyMapping(uint16_t event)
 bool keysPollingCycle()
 {
   uint32_t trims_input;
+  pollKeys();
   uint32_t keys_input = readKeys();
 
 #if defined(USE_HATS_AS_KEYS)
diff --git a/radio/src/targets/common/arm/stm32/csd203_sensor.cpp b/radio/src/targets/common/arm/stm32/csd203_sensor.cpp
index 66fbb2ffa..bb4b0f7da 100644
--- a/radio/src/targets/common/arm/stm32/csd203_sensor.cpp
+++ b/radio/src/targets/common/arm/stm32/csd203_sensor.cpp
@@ -171,6 +171,8 @@ typedef struct {
 } CSD_ALERT;
 /*CSD ALERT Configuration struct*/
 
+extern bool suspendI2CTasks;
+
 void CSD203_Init(CSD_CONFIG *CSD203_CFG);            // Initialise CSD203 config
 uint16_t CSD203_ReadVbus(CSD_CONFIG *CSD203_CFG);    // Read Vbus Voltage
 uint16_t CSD203_ReadRshunt(CSD_CONFIG *CSD203_CFG);  // Read Rshunt
@@ -410,6 +412,8 @@ void readCSD203(void)
 {  // 5ms
   static uint16_t GetSenSorStep = 0;
 
+  if (suspendI2CTasks) return;
+
   if (IICReadStatusFlag == true) return;
 
   IICReadStatusFlag = true;
diff --git a/radio/src/targets/pa01/bsp_io.cpp b/radio/src/targets/pa01/bsp_io.cpp
index fac0ed112..6e58c3230 100644
--- a/radio/src/targets/pa01/bsp_io.cpp
+++ b/radio/src/targets/pa01/bsp_io.cpp
@@ -56,10 +56,14 @@ bool bsp_get_shouldReadKeys()
   return tmp;
 }
 
+static volatile bool errorOccurs = false;
 static void bsp_input_read()
 {
   uint16_t value;
-  if (aw9523b_read(&i2c_exp, BSP_IN_MASK, &value) < 0) return;
+  if (aw9523b_read(&i2c_exp, BSP_IN_MASK, &value) < 0) {
+    errorOccurs = true;
+    return;
+  }
   inputState = value;
 }
 
diff --git a/radio/src/targets/pa01/key_driver.cpp b/radio/src/targets/pa01/key_driver.cpp
index 6e082fcca..c39b560a6 100644
--- a/radio/src/targets/pa01/key_driver.cpp
+++ b/radio/src/targets/pa01/key_driver.cpp
@@ -68,13 +68,15 @@ enum PhysicalKeys
   ENT  = 16
 };
 
+extern bool suspendI2CTasks;
+
 static bool fct_state[4] = {false, false, false, false};
 static uint32_t keyState = 0;
 #if !defined(BOOT)
 static uint32_t nonReadCount = 0;
 #endif
 
-static uint32_t _readKeyMatrix()
+void pollKeys()
 {
 #if !defined(BOOT)
   if(!bsp_get_shouldReadKeys() && nonReadCount < 10)
@@ -83,10 +85,12 @@ static uint32_t _readKeyMatrix()
       keyState |= 1<<ENT;
 
     nonReadCount++;
-    return keyState;
   }
   nonReadCount = 0;
 #endif
+
+  if (suspendI2CTasks) return;
+  
   // This function avoids concurrent matrix agitation
 
   uint32_t result = 0;
@@ -98,13 +102,17 @@ static uint32_t _readKeyMatrix()
     uint8_t ui8ReadInProgress = 0;
   } syncelem;
 
-  if (syncelem.ui8ReadInProgress != 0) return syncelem.oldResult;
+  if (syncelem.ui8ReadInProgress != 0) {
+    keyState = syncelem.oldResult;
+  }
 
   // ui8ReadInProgress was 0, increment it
   syncelem.ui8ReadInProgress++;
   // Double check before continuing, as non-atomic, non-blocking so far
   // If ui8ReadInProgress is above 1, then there was concurrent task calling it, exit
-  if (syncelem.ui8ReadInProgress > 1) return syncelem.oldResult;
+  if (syncelem.ui8ReadInProgress > 1) {
+    keyState = syncelem.oldResult;
+  }
 
   // If we land here, we have exclusive access to Matrix
   bsp_output_set(BSP_KEY_OUT_MASK, ~BSP_KEY_OUT1);
@@ -170,8 +178,6 @@ static uint32_t _readKeyMatrix()
   fct_state[3] = (result & 1<<KEY4)?true:false;
 
   keyState = result;
-
-  return result;
 }
 
 void keysInit()
@@ -183,7 +189,7 @@ uint32_t readKeys()
 {
   uint32_t result = 0;
 
-  uint32_t mkeys = _readKeyMatrix();
+  uint32_t mkeys = keyState;
   if (mkeys & (1 << PGUP)) result |= 1 << KEY_PAGEUP;
   if (mkeys & (1 << PGDN)) result |= 1 << KEY_PAGEDN;
   if (mkeys & (1 << RTN))  result |= 1 << KEY_EXIT;
@@ -195,7 +201,7 @@ uint32_t readKeys()
 
 uint32_t readTrims()
 {
-  uint32_t mkeys = _readKeyMatrix();
+  uint32_t mkeys = keyState;
 
   return mkeys & 0xff;  // Mask only the trims output
 }
diff --git a/radio/src/targets/simu/simpgmspace.cpp b/radio/src/targets/simu/simpgmspace.cpp
index 1a1477d19..035d22581 100644
--- a/radio/src/targets/simu/simpgmspace.cpp
+++ b/radio/src/targets/simu/simpgmspace.cpp
@@ -268,6 +268,10 @@ bool getHatsAsKeys()
 }
 #endif
 
+void pollKeys()
+{
+}
+
 uint32_t readKeys()
 {
   uint32_t result = 0;
diff --git a/radio/src/targets/st16/key_driver.cpp b/radio/src/targets/st16/key_driver.cpp
index 5905a140b..d1b1afad8 100644
--- a/radio/src/targets/st16/key_driver.cpp
+++ b/radio/src/targets/st16/key_driver.cpp
@@ -58,9 +58,14 @@ enum PhysicalTrims {
   TR4R
 };
 
+extern bool suspendI2CTasks;
+
 uint32_t readTrims()
 {
   uint32_t result = 0;
+
+  if (suspendI2CTasks) return result;
+
   uint16_t keys = bsp_input_get();
   
 #define _TRIM(t) \
diff --git a/radio/src/targets/taranis/gx12/bsp_io.cpp b/radio/src/targets/taranis/gx12/bsp_io.cpp
index 0041efd8c..77d3b4ba4 100644
--- a/radio/src/targets/taranis/gx12/bsp_io.cpp
+++ b/radio/src/targets/taranis/gx12/bsp_io.cpp
@@ -36,6 +36,7 @@
 #define IO_RESET_GPIO GPIO_PIN(GPIOE, 15)
 
 extern const stm32_switch_t* boardGetSwitchDef(uint8_t idx);
+extern bool suspendI2CTasks;
 
 struct bsp_io_expander {
   pca95xx_t exp;
@@ -84,6 +85,9 @@ static void _poll_switches(void *param1, uint32_t trigger_source)
     timer_reset(&_poll_timer);
   }
 
+  // Suspend hardware reads when required
+  if (suspendI2CTasks) return;
+
   _read_io_expander(&_io_switches);
   _read_io_expander(&_io_fs_switches);
 }