Anecdotally a lot of issues seem to affect those using sleep mode and/or external storage. With a lack of 'official' cause it's led to some people just not using those features. I was using external storage but detaching it and shutting down totally after use. The one time I used sleep without detaching, I resumed Valhalla which promptly froze and caused a hard lock. Then on reboot got the 'corrupt' message and had to rebuild. So went back to what I was doing before. It might be placebo or related