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This is a Prusa MINI+ that has worked flawlessly for 3 months. Suddenly the prints won't stick to the bed, the first layer is all messy and I cancel the print before anything worse happens.

• The printer has auto bed leveling so I would rule that out.
• The plate is cleaned with 70% IPA, so it's not dirty either.
• I have tried to adjust the "Live Z Adjust" while printing that first layer, but no setting works well.
• Each filament is printed at recommended temps (+/- 215C) and bed is at 60C.
• Out of my 5 spools, only 1 works well: RepRapper 3-color PLA. Even the Prusament PLA fails to stick well, and also eSun PLA+, and eSun matte PLA, and Tinmorry TPU.

https://i.imgur.com/MEpK37W.png

Update:

• Thank you all for your kind input.
• I washed the plate, and cleaned the nozzle (have no spare nozzle).
• I also did a fresh Z-test (with this object) using Prusament galaxy silver PLA.