I agree. Why would it become un-level that quickly? But every time that bed went down and then back up to the nozzle the gap between it and the nozzle tip was different. Sometimes the gap was too wide, sometimes there was no gap at all. I thought maybe the bed was not stopping at the exact same height which would explain the varying gaps but that was a guess and not based on any evidence.

So....I leveled the bed as you instructed and am printing stuff now. I will try several different prints and I won't touch the bed adjustment. Stay tuned!!!