Hey Frank,
So my setup is DELL poweredge R710. I don't have any UPS and power cut happened this Monday 22nd f Jan, twice. First one was at 6:00 then one more followed 1.5h later. Since Monday I have been struggling to get drive 6 back on-line.
It could be that something has happened on 17th of Jan. I was on business trip so I can't really say that I have noticed anything unusual before. Since that I can't access VM Home assistant I would be sure that if this would happened on 17th I would know for sure.