So, the current 4x4TB file server now has two bad sectors on one drive. I was waiting for that to happen eventually, as history showed some weak sectors in a certain area. Thinking the corruption issues will stop here for now.

The old 4x2TB (3x2TB) file server had one bad sector on one drive within a week of setting it up (2015) and remained there until its retirement in 2022. So, I'm pretty optimistic so far. 🙂