https://devzone.nordicsemi.com/f/nordic-q-a/75681/nrf51-sd8-timeslot-rbcmesh-sometimes-crachesHi, we have a product (NRF51 SD8 S110 RBCMesh) on the market that craches about once per year the line that asserts is line 189 in src\\soc_radio_timeslot.c (your code) and we think we know the source of the problem In the latest RBCmesh source httpsen-USTelligent Community 13Fri, 28 May 2021 15:21:16 GMThttps://devzone.nordicsemi.com/thread/312438?ContentTypeID=1Fri, 28 May 2021 15:21:16 GMT137ad170-7792-4731-bb38-c0d22fbe4515:31bba2df-404d-4f10-894f-2ed236f5411dMttrinh<p>Hi,</p> <p>I asked one of developers and this is his response:</p> <p><em>I don&#39;t think that it will make much difference, but you can test and see. The fix was a workaround for a softdevice version that is only available on the nRF52.</em></p> <p><em>They should instead&nbsp; try increasing the time-margin of the timeslot. These:</em></p> <p><em><a href="https://github.com/NordicPlayground/nRF51-ble-bcast-mesh/blob/9647fd7357a6a66741f30ea97913874d4cb30bcc/nRF51/rbc_mesh/src/timeslot.c#L53-L60">https://github.com/NordicPlayground/nRF51-ble-bcast-mesh/blob/9647fd7357a6a66741f30ea97913874d4cb30bcc/nRF51/rbc_mesh/src/timeslot.c#L53-L60</a></em></p> <p><em>They could also see if they locks IRQs for too long somewhere. This can happen if it locks for more than 30us.</em></p> <p>Hope this helps.</p><div style="clear:both;"></div>