Hi,
We have a product already on the market for about 2 years, based on nrf52840 and nrf52832.
The product receives data from an 'external device' via UARTE, forwards the data to a washing machine via UARTE, get response from the machine, sends it back to the device. Repeat.
The device is using a reoccuring freertos timer started with app_timer_create and app_timer_start which updates a TIME variable via a callback. Timer is 'APP_TIMER_MODE_REPEATED'.
Recently we noticed some devices 'hanging' and I found the cause: POWER_CLOCK_IRQHandler' gets called after ~100seconds under, which stops updating the TIME variable via timer callback, and the firmware freezes as it needs time capability.
'nrf_clock_lf_is_running()' returns true and 'NRF_RTC1->COUNTER' is no more incremented.
It seems that if the 'external device' is in the mode which sends lots of data to our device, the bug is occuring. The bug is even occuring when I am not explicitly reading serial data from the external device.
If the device is set in a mode that sends data rarely, the bug does not seem to occur. Also the problem is not occuring if we disconnect the 'external device' to it.
Any ideas what might causing the disabling of the CLOCK interrupt?
Thank you.
