cnMatrix EX2052-P is in Sync error

Since last 48 hours all of sudden one of switch is in Sync error mode, tried to sync via CnMaestro - kept going offline in cloud, although connected with internet but cant access it via CnMaestro.
Cannot login via web GUI, but can log in via SSH, try to reboot switch couple of times - still same issue.
Switch is running on 4.5-r3 firmware. Cannot download show tech from SSH even.

Any known bug or any input is highly appreciable.