I've been mining since 2017.  I've gone on numerous vacations and left all my rigs running.  Never an issue... other than it sometimes stopped running due to power outages.  Zero melt downs, zero fires, zero blown circuits...  A question I do have... If you leave your house/apt for any amount of time (grocery shopping, eating out, socializing, visiting friends and family) do you shut your miner down during those hours of leave.  If not, its really no different because the malfunction you are concerned about can happen at any time and if you away for even 10 minutes and it happens you still aren't home to stop the issue.