Alix reboot

Hi everyone,
we installed the Mikrotik RouterOs on Alix 2d2d.
We’re using for about 2 weeks and we found the following serious problem:
the Alix is rebooted after a random period of time, without any justification!!

Looking for the cause of the problem in the logs, we found only:

“router was rebooted without proper shutdown”

Do you think the problem is due to the board? or what else?

Tks

it could be power, or hardware related, based on that error. this forum is about mikrotik hardware, please write in the manufacturers forum about this issue.