madaway

Hi I have got my ender 3 back out to reuse but having some issues I can print all test prints with some success but when I go to do anything new its just comes out as a mess. I have releveled the bed and checked the blts which seem ok, so I'm a bit stumped. Some times it sticks to bed but then sticks to the nozzel and othertimes it starts well but goes wrong a few minutes later.using cura 4.6 thank you for any help.