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"When should moderators delete comments? Same advice as for flaggers: when they offer nothing of value to either the author of the post or to future readers." A guide to moderating comments
@RowanHawkins exactly my point. If the causes are unknown and the issue disappeared after a reboot without reason, keeping the question open makes no sense.
Considering that the newest vms question was asked on '13 and it's a 7 years old tag, I doubt that it will be useful on the short term, much less the long one.
When you burn those kind of tags "This is not system administration within the meaning of Server Fault" you need to go with a hammer too, to close those questions along the way.
