diff --git a/sampler/lib/Audio_SdFat/play_sd_wav.h b/sampler/lib/Audio_SdFat/play_sd_wav.h
index f852d69..2136fae 100644
--- a/sampler/lib/Audio_SdFat/play_sd_wav.h
+++ b/sampler/lib/Audio_SdFat/play_sd_wav.h
@@ -34,32 +34,32 @@
 class AudioPlaySdWav : public AudioStream
 {
 public:
-	AudioPlaySdWav(void) : AudioStream(0, NULL), block_left(NULL), block_right(NULL) { begin(); }
-	void begin(void);
-	bool play(const char *filename);
-	void stop(void);
-	bool isPlaying(void);
-	uint32_t positionMillis(void);
-	uint32_t lengthMillis(void);
-	virtual void update(void);
+  AudioPlaySdWav(void) : AudioStream(0, NULL), block_left(NULL), block_right(NULL) { begin(); }
+  void begin(void);
+  bool play(const char *filename);
+  void stop(void);
+  bool isPlaying(void);
+  uint32_t positionMillis(void);
+  uint32_t lengthMillis(void);
+  virtual void update(void);
 private:
-	File wavfile;
-	bool consume(uint32_t size);
-	bool parse_format(void);
-	uint32_t header[10];		// temporary storage of wav header data
-	uint32_t data_length;		// number of bytes remaining in current section
-	uint32_t total_length;		// number of audio data bytes in file
-	uint32_t bytes2millis;
-	audio_block_t *block_left;
-	audio_block_t *block_right;
-	uint16_t block_offset;		// how much data is in block_left & block_right
-	uint8_t buffer[512];		// buffer one block of data
-	uint16_t buffer_offset;		// where we're at consuming "buffer"
-	uint16_t buffer_length;		// how much data is in "buffer" (512 until last read)
-	uint8_t header_offset;		// number of bytes in header[]
-	uint8_t state;
-	uint8_t state_play;
-	uint8_t leftover_bytes;
+  File wavfile;
+  bool consume(uint32_t size);
+  bool parse_format(void);
+  uint32_t header[10];            // temporary storage of wav header data
+  uint32_t data_length;           // number of bytes remaining in current section
+  uint32_t total_length;          // number of audio data bytes in file
+  uint32_t bytes2millis;
+  audio_block_t *block_left;
+  audio_block_t *block_right;
+  uint16_t block_offset;          // how much data is in block_left & block_right
+  uint8_t buffer[512];            // buffer one block of data
+  uint16_t buffer_offset;         // where we're at consuming "buffer"
+  uint16_t buffer_length;         // how much data is in "buffer" (512 until last read)
+  uint8_t header_offset;          // number of bytes in header[]
+  uint8_t state;
+  uint8_t state_play;
+  uint8_t leftover_bytes;
 };
 
 #endif
diff --git a/sampler/platformio.ini b/sampler/platformio.ini
index cd30915..3e51ed2 100644
--- a/sampler/platformio.ini
+++ b/sampler/platformio.ini
@@ -16,6 +16,7 @@ lib_ignore = Audio, SD
 lib_deps =
   721 ; TaskScheduler
   322 ; SdFat
+  401 ; Adafruit SleepyDog Library
 
 [env:teensy35]
 platform = teensy
diff --git a/sampler/src/main.cpp b/sampler/src/main.cpp
index e3138f6..8894c90 100644
--- a/sampler/src/main.cpp
+++ b/sampler/src/main.cpp
@@ -33,6 +33,9 @@
 // #define ANALOG_REF_EXTERNAL_3P3V
 //----------</configuration>----------
 
+//watchdog
+#include <Adafruit_SleepyDog.h>
+
 //teensy audio
 #include <Audio.h>
 #include <SdFat.h>
@@ -121,7 +124,7 @@ public:
     // the filename to play is...
     Serial.println(filename);
     // go! (re-triggering)
-    if (player.isPlaying()) player.stop();
+    // if (player.isPlaying()) player.stop();
     player.play(filename);
     Serial.println("1");
     // --> we just believe that this 'file' is existing & available. NO additional checking.
@@ -303,6 +306,9 @@ void playcheck() {
   // //
   // Serial.print("AM_max:");
   // Serial.println(AudioMemoryUsageMax());
+
+  //watchdog
+  Watchdog.reset();
 }
 //
 Task playcheck_task(100, TASK_FOREVER, playcheck, &runner, true);
@@ -462,6 +468,9 @@ void setup() {
 
   //
   Serial.println("[setup] done.");
+
+  //watchdog
+  Watchdog.enable(1000);
 }
 
 void loop() {