CCR-1036-EM Hang and must power restart! ( No NTP Configured)

Dear ,

I have a problem with CCR-1036-EM devices, both of my border CCR is Hang for a random time for a same time. I can’t recognize the problem. and must restart power cycle. Is there any experience the same problem?

I have upgraded to the latest stable 6.33 Ros Version and there is no sntp configured.

Thanks!!