Random CL2537 Error

Good evening everyone, I have a problem with my K1 Max that I can’t figure out. After a print, the bed is at about halfway up. If I start a second print, the bed rises but then drops back down twice as far as it went up, reaching the end of its travel, and then displays error CL2537.
To move the Z-axis and bring it to about 10–12 cm from the extruder, I have to open the bottom and manually adjust the belt.

Quando il piano si trova a circa metà dell’altezza devo spegnere e accendere la stampante e l’errore sparisce.
Non saprei dove agire perchè non capisco cosa lo genera.
Qualcuno mi potrebbe aiutare?

Renato
PS ho già controllato tutti i cavi e le connessioni.