H510 repeatedly reboots.

[Hiro]

Hello everyone, I'm looking for a case of a "case".
I was wondering if anyone knows of a similar case.

I am currently managing a building with 4 H510s connected from one L3 switch.
One of those H510s has one server connected to it from a LAN port.
The LAN ports are separated by VLANs, but the pathway is the same for all four, and they all share the same configuration, except that the server is connected to it.

However, only this one machine is automatically restarting itself repeatedly by Heartbeat losing frequently.
The timing is set to reboot after 30 minutes of the AP not being able to reach the GW, which seems to be the case.
While it is up and running, it is visible to the controller and can be operated.

I have tried changing to a spare H510 and updating the firmware, but the situation is the same.
After rebooting, communication is possible for a while, but at some point, the reboot seems to occur again.

The current version is as follows

vSZ-H
Controller 5.2.2.0.1563
Plain soft 5.2.2.0.1540
APfirmware 5.2.2.0.2069

Also, WLAN service has been suspended as it would hinder identification of the phenomenon.

Any tips are welcome.
Best regards.