diff --git a/variants/lilygo_twatch_s3/TWatchS3Board.cpp b/variants/lilygo_twatch_s3/TWatchS3Board.cpp
index 0644282f..9dff8bb2 100644
--- a/variants/lilygo_twatch_s3/TWatchS3Board.cpp
+++ b/variants/lilygo_twatch_s3/TWatchS3Board.cpp
@@ -4,11 +4,12 @@
 #include <esp_bt.h>   // power-debug: esp_bt_controller_get_status()
 
 volatile bool TWatchS3Board::_tilt_flag = false;
+volatile uint32_t TWatchS3Board::_tilt_isr_count = 0;   // TEMP diagnostic
 
 // memw forces the _tilt_flag store to retire to SRAM before this ISR
 // returns. Without it, tiltFired() in the main loop can read a stale
 // value and raise-to-wake is missed. Do not remove.
-void IRAM_ATTR TWatchS3Board::onTiltISR() { _tilt_flag = true; asm volatile("memw" ::: "memory"); }
+void IRAM_ATTR TWatchS3Board::onTiltISR() { _tilt_flag = true; _tilt_isr_count++; asm volatile("memw" ::: "memory"); }
 
 // ---- Wrapper-free BMA423 step counter (raw I2C) ----------------------------
 // SensorLib's SensorBMA423 step-counter methods do not compile in this build,
@@ -223,6 +224,14 @@ bool TWatchS3Board::tiltFired() {
     _accel->update();                 // reading the status clears the sensor INT
     return true;
   }
+  // TEMP diagnostic: periodically report the raw INT pin level and ISR count,
+  // to distinguish "pin stuck high / never re-arms" from "never asserts".
+  static unsigned long _tilt_dbg_next = 0;
+  if (millis() >= _tilt_dbg_next) {
+    _tilt_dbg_next = millis() + 5000;
+    Serial.printf("[TILT] pin=%d isr_count=%u\n",
+                  digitalRead(PIN_ACCEL_IRQ), (unsigned)_tilt_isr_count);
+  }
   return false;
 }
 
diff --git a/variants/lilygo_twatch_s3/TWatchS3Board.h b/variants/lilygo_twatch_s3/TWatchS3Board.h
index fd654cfd..ec31e72b 100644
--- a/variants/lilygo_twatch_s3/TWatchS3Board.h
+++ b/variants/lilygo_twatch_s3/TWatchS3Board.h
@@ -26,6 +26,7 @@ class TWatchS3Board : public ESP32Board {
   XPowersAXP2101* _axp = NULL;   // same object as PMU, concrete type
   SensorBMA423* _accel = nullptr;
   static volatile bool _tilt_flag;
+  static volatile uint32_t _tilt_isr_count;   // TEMP diagnostic
   static void IRAM_ATTR onTiltISR();   // defined in the .cpp (IRAM relocation)
 
   bool power_init();