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Time counter for miner is refreshed from time to time

Recently I saw that time counter for miner is refreshed. For example, rig online is 1 day and miner online 5 hours.
As I understand it means that miner was restarted. But I can’t found in logs that it was restarted and reason why it was restarted.
What kind of logs can be checked?

The same issue, did you found out what was happening?