Virtual private servers will go down briefly so I can compare BIOS settings between a machine that is stable and the mail server which presently is not. When I updated the BIOS to resolve a fan issue, it reset all settings to default. I tried to set them back the best I could by memory but suspect didn’t do the best job so will be attempting to correct that tonight.
The virtual private servers should only be down a few minutes, the mail server somewhat longer as I will be running memory diagnostics to eliminate the possibility of a bad DIMM. It may take several hours of intermittent downtime to resolve these issues.