CR-10 v1 sizing errors

Hiya, been having some problems printing lately

Whenever i start a print, it will do fine for the most part, but after some time it will get confused and basically think the printing plate is larger or smaller, hence re-scaling the print to either bigger or smaller layers, making it literally impossible to print anything. It has had a new board in it (bigtreetech) and has been reprogrammed multiple times, but the problem still seems to persist and im not sure whats causing it. Any help?

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loosen the screwholders where the liftingscrews run through they must not be tight. it needs a few millimeter backlash.