I’ve found that my restore points mysteriously disappear after “critical updates.”
I have occasionally have to revert to my most recent image backup.
I have my programs on the OS partition, but my data is on a separate partition (and I backup the data to USB drives), so it is not impacted by software conflicts.
When everything seems to be working, I hate getting notified of UPDATE/UPGRADE. They tend to create more problems than they resolve.
Drill into system restore and see how much space is allocated to it. Might not be enough so you are getting restore points deleted. These restore points might take up a gigabyte or so..... so act accordingly.