Hard lock on requesting CAP Certificate

I recently got 2 new wAP ac (EU version) accesspoints.
One of them is completely fine, the other one has a problem when I try to request a CAP certificate. It immediately reboots, the AP/CAP light starts flashing like it is looking for the CAPsMAN router and doesn’t get to the point where I can connect to it again. The only thing I can do is a factory reset, but it will crash every time on requesting the certificate.
I installed the latest stable packages and bootloader.
The other accesspoint is working without issues (cloning its setup doesn’t work either).
Any ideas?

Thanks in advance,

Gieke


EDIT: Problem solved by revoking certificate on CAPsMAN Server (System → Certificates)

I would first try to cross change the PSU. Bad PSU can do strange things..
If same result, I would check/upgrade RouterOS and firmware version on the failing WAP AC.

Thanks for the response quackyo

Quick update: it doesn’t actually hard lock anymore (I can’t reproduce it either, no idea what I did and now I am unsure it even did before).
Now the problem is when I select it to “request” a certificate in CAP it disconnects from the CAPsMAN router as expected but it refuses to connect again. No certificate is shown.
I tried swapping the PSU, power injector, network cable and port on the switch.