App crashes on SDK 1.4.1

[_dev_]

Hi,

I've just moved to nRF Connect 1.4.1 from 1.3.0 and my application started crashing at random place.

Also, I've started seeing the following error in the output and the app doesn't accept AT commands anymore.

"[00:00:00.000,183] <inf> at_host: UART check failed: 12. Dropping buffer and retrying."

Under debug it shows this

 

CONFIG_RESET_ON_FATAL_ERROR=n doesn't show any additional info.

CONFIG_MAIN_STACK_SIZE=4096
CONFIG_HEAP_MEM_POOL_SIZE=4096

tried to increase parameters above to 8192 with no luck

Thanks

[_dev_]

quick update:

Switched to SDK v1.4.99-dev1  (Toolchain version 1.4.0)

No more random crashes, which is good. AT still doesn't work (AT example doesn't work too)