https://devzone.nordicsemi.com/f/nordic-q-a/20662/lfclk-timer-slows-to-a-crawlI have a program which uses two timers to flash an LED, alternating between flashing once every 5s for 15s, then once every 0.25s for 15s. If I run this on the nRF52-DK with the external LFCLK, it works fine (15 hours and counting). If I run thisen-USTelligent Community 13Wed, 22 Mar 2017 13:41:35 GMThttps://devzone.nordicsemi.com/thread/80569?ContentTypeID=1Wed, 22 Mar 2017 13:41:35 GMT137ad170-7792-4731-bb38-c0d22fbe4515:151f8d7f-8a5a-40b7-b6dd-0bf2eabbb435Hung Bui<p>This is very strange. You are telling you can see the TICK event happens normally but not the COMPARE event ? If you print out counter value when you have a TICK , what do you see when it passes the CC value ? May it have anything to do with your code ? Could you simplify the code down and test, maybe simply use (modify if needed) RTC example for testing.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/80568?ContentTypeID=1Wed, 22 Mar 2017 10:17:35 GMT137ad170-7792-4731-bb38-c0d22fbe4515:2c25d145-0925-409b-962f-f0dcb96a582dSteve H<p>The BMD-300 has worked fine with an external crystal for about 18 hours.</p><div style="clear:both;"></div>