Bed crushing into nozzle


out of the blue the bed wouldn’t stop and crushed into the nozzle. Strangely, when I do calibration it does correct job recognizing each corner (I on purpose misaligned them and the printer recognized each corner), I checked all cables cleaned the bed etc. The printer does the calibration correct then crushes into the nozzle. This happened before but calibration would always take care of that, not this time. The printer has been in pretty much continuous use for the past 3 years.