Hi, I've been having some trouble lately with my 3d printer and I was hoping the community could help me out. I have been printing steadily on my CR-10 smart pro for a while now, and everything has been running smoothly, but suddenly I can't get anything to stick to the print bed. I had one print come undone halfway through, and now when I try to print not even the first layer sticks. I have tried multiple models and settings, cleaning the print bed and the nozzle, and readjusting my bed level. There's been a few times where the first ring of the skirt sticks to the bed, but when the printer comes back around, it pops right off and sticks to the nozzle instead, ruining the print.