Something weird has started happening when I print. Everything will be fine all of a sudden it will stop extruding filament. Hot end temp is still good, according to my temp readings. No error message on my smart screen. It keep chugging along like nothing is wrong. except for the fact that it's not extruding plastic. If I shut down remove the filament give it a clean cut and re-install everything seems to be fine. I go to do a print and then after a few hours same problem... Any ideas?? Could it be retracting to much and not grabbing it?