Prints keep getting knocked off of bed

[Schmudi]

Take a look to this:

New P1S Combo - nothing properly sticks to the build plate anymore

Hi there, I have a new P1S with AMS set up since saturday. It’s my first BambuLab, but I have a few years of printer-experience with other models. Since yesterday evening, nothing is sticking to the bed properly anymore. I was able to get one simple print to stick with a raft, but only then. I mainly use aftermarket filament (Elegoo, material4print), but the supplied BambuLab PLA doesn’t work either. The pre-sliced files from the SD card fail as well. I use the default textured PEI plate; and …