https://devzone.nordicsemi.com/f/nordic-q-a/33924/device-not-staying-in-dfu-modeMy device is entering DFU mode, staying there for a few seconds, then shutting down. I&#39;m trying to figure out a good way to figure out if it&#39;s a watchdog issue or a power supply issue. The device works totally fine outside of this DFU problem.en-USTelligent Community 13Wed, 02 May 2018 09:06:31 GMThttps://devzone.nordicsemi.com/thread/130479?ContentTypeID=1Wed, 02 May 2018 09:06:31 GMT137ad170-7792-4731-bb38-c0d22fbe4515:4ab58403-80f7-4064-af81-637385d99792Einar Thorsrud<p>As you mention the watchdog I wonder if you ever enable the watchdog in your application? If so, you must keep feeding it in the bootloader, or alternatively set a very long timeout. Can you verify that the watchdog is the issue by seeing if the problem goes away if you don&#39;t enable it in your application? I also want to mention that <a href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v15.0.0/lib_bootloader.html?cp=4_0_0_3_5_0_4#lib_bootloader_watchdog">Watchdog timer support</a>&nbsp;has been added in SDK 15.</p><div style="clear:both;"></div>