You might have a main board problem? I had an issue where the z axis took on a mind of its own. Simon sent me a new board and all is well.
One quick fix I di while waiting on the new board was to lower the Z stepper current (advanced settings motion control) to 900 mAh. Worked for me... Not saying that's what you're problem is , but at least it's one variable to test
How do you remove the print? Let you cool itdown completely or pull on it with force...?
I assume you have an UM2 so pls chech the metal latch on the bottom end stop if its bend. Can happen and is already described here in several posts.
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