Z axis zero level changed overnight

Spent a couple of hours yesterday leveling the bed and printing some test prints, everything looked great, even after a power cycle.

Went in today and started another print only to come in 20 minutes later and found plastic spaghetti all over the place. Somehow the machine reset it’s Z = 0 location to the very top of the Z axis. It was around 235 IIRC when homed yesterday, today it’s zeroed at the very top and will not move down. I did update the firmware yesterday.

Anyone have this problem?

Update: Ran a new 11X11 level and now it seems to read correctly. Now I just have to spend a @#$@#$ lot of time getting the new Z offset to be exactly right.