L2TP terminationg - administrator request issue

Hello.

Mikrotik v6.47.4

The equipment rebooted for no reason.
When checking the log, it comes out as follows.

L2TP : terminating .. - administrator request
device changed

No one has logged in at that time.
system history>print detail
U action=“device changed” by=“” policy=write time=may/22/2023 16:02:23

I want to know the cause of this problem.