My printers got a problem. I've been using this printer for about 4 months with minimal issues. Suddenly I went to print something and it didn't stick to the bed and the print wasn't smooth. After some investigation when I tried to re-level the bed, the middle is higher than the 4 sides. I upgraded to the dual z axis thinking that maybe that would fix the issue. I did not. Any ideas on what I should try next? I've checked the X axis and it appears to not be bent, the glass bed isn't warped (tried 2 different beds), the z axis rods are parallel, I've changed nozzles and bed springs but still no different result. I've run out of ideas and options as to what to do next.Printer: Ender 3 Pro completely stock other than dual z axis and glass bed. Thanks for any ideas you might have!