Print bed adhesion because of worn print bed?

Hey,

For a few days now, I can't print on my V-Minion because the print bed adheres poorly or not at all when I print a simple square without a brim. I cleaned the bed with dish soap and isopropanol. Calibrated the Z-offset and did a PID tune. And this happened with several different PLAs that worked fine before.
I don't know what to check next. Is it possible that the print bed is worn out?
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