PETG filament suddenly stopped sticking to bed

[shcenator 0]

Hi

 

I have searched the forums and found several cases where people have perfectly working printers and then suddenly filament stops sticking to the bed. However, I have not come across any working solutions in those posts. I was printing PETG and HIPS on spidersheet with glue since PETG otherwise would stick too well. I have made many prints all with great adhesion. Then suddenly nothing works. It drives me mad. I am doing everything as usual. The filament is dry, I clean with iso after each run, I have tried sanding the bed, I am relevelling every time and have tried different z-offset etc etc. Can somebody help me?

[shcenator 0]

The only idea I read worked for a guy was tightning the z-axis limit switch. Does this make any sense?