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TSR : watchdog reboot
time : 08/08/2021 11:55:25
trace log : warmboot
tiem : 08/08 11:54:38
On August 8, 2021 at 11:54 sonicwall rebooted.
Is this a hardware issue?
Usually, warm boots can occur due to multiple reasons like RAM exhaustion, deadlocks, etc but they are usually due to software/firmware reasons and not hardware. I see that you are on a very old firmware version, 188.8.131.52. I would request to upgrade to 184.108.40.206 and then to 220.127.116.11 and then monitor.
In these scenarios, it would be best to collect the TSR, EXP, Logs, and tracelogs and file a case with SonicWall support for detailed analysis.