https://devzone.nordicsemi.com/f/nordic-q-a/25705/wait-hangs-after-rebootHi, &quot;wait&quot; hangs when running the mbed blinky example, build in develop or release, on nrf52840. The program is flashed with a J-Link and the program runs OK at first, but after a reboot the program hangs at the first wait. I have tested to commenten-USTelligent Community 13Fri, 06 Oct 2017 14:29:23 GMThttps://devzone.nordicsemi.com/thread/101272?ContentTypeID=1Fri, 06 Oct 2017 14:29:23 GMT137ad170-7792-4731-bb38-c0d22fbe4515:edb974ce-abc3-4b8c-82bd-a53120314f0fJ&#248;rgen Holmefjord<p>Hi,</p> <p>It seems your issue is related to a <a href="https://github.com/ARMmbed/mbed-os/issues/4893">known issue</a>. mbed-os will try to put the MCU to sleep at any time it does not detect any activity. You can find a hotfix that should solve the issue in <a href="https://github.com/ARMmbed/mbed-os/pull/5086">this pull-request</a>.</p> <p>Best regards,</p> <p>Jørgen</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/101271?ContentTypeID=1Fri, 06 Oct 2017 12:38:59 GMT137ad170-7792-4731-bb38-c0d22fbe4515:9b8ab34f-f048-44c2-9129-a72e77bf6dddH&#229;kan Evertsson<p>I&#39;m using mbed-os-5.5.5 and compiler gcc-arm-none-eabi-5_4-2016q3</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/101270?ContentTypeID=1Fri, 06 Oct 2017 12:30:51 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ffe77c33-617e-4f2a-b2ec-3657a514dc33J&#248;rgen Holmefjord<p>What version of mbed os are you using? What compiler are you using? I&#39;m not able to reproduce this issue.</p><div style="clear:both;"></div>