Using a Tronxy x5sa pro. Ultimaker 4.8.0. I have built quite a few items with no problems. I have changed something but I don’t know what. All the controls work on theories get as designed. I attempted to upgrade to Marlin but there was too much involved with setting it up, and I am waiting for my nephew to get his built before I make too many changes. I converted back to the original firmware. Anyway, when printing, after the first layer the bed actually rises slightly so the nozzle drags the build off of the surface resulting i a birds nest. I have layer my finger on the coupler for the z axis shaft and can feel it rotate. It is not just one item, it is every item that I build. The bed is level and z axis is adjusted properly. It started this a few days ago and I just had time to run it down today. I don’t go fast due to cancer pain and tiredness. It is relaxing to trouble shoot but I am stuck on this. Thanks for your advice.