SG500 stack resetting

[MaxPresi]

Happy New Year to everyone.

I have a serious problem, which started to happen on 01/01/2022.

I have 5 sg500-52 switches stacked, every day at around 11pm and 1am, units 2, 4 and 5 lose connection to Master, where unit 2 becomes master of 4 and 5.

By the Stack settings, 4 and 5 are configured as slave and Unit ID After Reset as 4 and 5 respectively.

In case 2, it is as backup and Unit ID After Reset as Auto.

In the Master Log, it appears that it lost connection only with 4 and 5, without communicating anything about 2. There are no power spikes or outages.

The 2, looks like it has reset, it changes the stack ports (from S1-S2 to S3-S4), back to 192.168.1.254 and so on.

When accessing it and changing the stack ports to S1-S2 again, everything works normal again.

What could be happening?

Sorry if there's lack of information or if I made silly questions, but they fired the old analyst who took care of everything and they dropped this bomb in my lap and I need to sort it out.

Thanks

[marce1000]

 - Use and or configure a (central) syslog server on all involved devices, then follow-up  all messages on  the syslog-collector (the syslog-server) when this happens, check if a problem-pattern can be determined.

           https://www.cisco.com/c/en/us/support/docs/smb/switches/cisco-250-series-smart-switches/smb2873-configure-remote-log-server-on-a-switch.html

 M.

[balaji.bandi]

There are a couple of suggestions :

1. check any latest firmware upgrade and test it.

2. replace the device stack cable with a new one and test it.

If you have support contract raise an TAC case with SMB Tac case.