We have 3 CBS350-24XTS stacked in a ring topology with SFP-H10GB-CU1M. Recently the Backup and the Slave unit started rebooting in a loop with the message:
%Stack-E-STCK-EXCEP-HNDLR: Lost connection with unit 2 reason : connection timeout. Unit will be rebooted .
This also happens for unit 3.
Only the Master unit stays up, without rebooting. The other units boot, and after 5 or 15 minutes reboot and start the loop again.
The port channels are all configured with the "no negotiate" option set before they came up. All the port channels have SX SFPs connected to other CBS350 stacks. The switches in the other stacks haven't rebooted.
