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I have the same problem + 2 extra problems. Used the printer for 2 to 3 months bougt it in august was delivered in september.
the other 2 problems are:
1 right arm goes up same as left as printing starts and then slams down on build plate, left is no problem
2 My fan in the PSU is making a lot of noise

contact Anycubic and all they do till now is asking questions and not answering my questions. not very happy at the moment with the printer or the support. till last week all was fine.