The resin sticks to the bottom of the tub. Mono 4k

Good day, dear forum members. I congratulate you on the coming new year, with the hope that it will be better. I’m contacting you on a whim because of this problem - my brand new anycubic photon mono 4k did its first print almost perfectly, but then problems started, especially with printing supports. Each subsequent print simply sticks to the Teflon bottom of the tub. I will be very grateful for help with advice😁
Sorry for the mistakes, I am translating through Google translator.