Ender 3 v2 printing problem Last week, my printer worked really well, but after a print it started having some printing problems. The printer stops extruding mid-print or under extrudes.
After this happened, I

leveled the bed again
increased hotend temperature from 200 to 215 °C (PLA)
changed slicer (I was using Ultimaker Cura), now I'm using Creality slicer
changed the transmission ratio 93 to 106 according to this video


                
            
After making adjustments according to the video, the printer still stops extruding mid-print or under extrudes. What should I do to fix this?
One common reason for extrusion to stop in the middle of a print is heat creep.  See What are ways to avoid heat creep?