AWS OTA Job in queued status

I previously have a working AWS OTA job to update firmware for my STM32H7.
But yesterday, it stops working, and the job status shows queued and seems stuck here.
I check firmware side and verify no change there and the device side already shows accepted as below:
$aws/things/xxxxxx/jobs/$next/get/accepted
but the job never gets dispatched.
May I know any reason it stop working? any area worth I to take a look?
thanks

Did anything change between the working and not working code? Can you post the logs?

my bad, reason is PlatformImageState.txt file has changed the state, so it will not take further OTA. close it. sorry for that