Ender 3 V3 SE issues

I have an Ender 3 V3 SE and it has printed flawlessly out of the box for a month and as of yesterday it has started to gum up the nozzle and it appears that it is from the material not sticking to the bed. So far I tried cleaning the nozzle(no change), installed new nozzle(no change) and cleaned the bed with isopropyl alchohol(no change) Nozzle temps and bed temp have not been changed. What else can I try??

Re-calibrate and re-level? The other day mine was printing perfectly then the next print it went about 0.2 too high on the Z. Reset it and it is now fine, I may have manually moved the gantry or something silly.