Prints going bad after certain time.

Hello, I’ve had an Ender 3 V2 Neo for approximately 2 years, and now the prints are constantly failing. I tried several ways of troubleshooting. In short, the print starts out good and it perfectly prints small calibration parts like CaliDragon, CaliCat. The table is well aligned, the filament is new, I checked for blockages, the extrusion speed and quantity are correct. I thought the problem might be the spring pressure on the extruder arm, but even after removing that little pin to reduce the pressure, the problems persist. I suspect it is a temperature problem with the machine, or the extruder. Thanks for the help!