Unfortunately, you need to “feel” this printer due to issues as described in my post: My honest opinion about K2 Plus after two month
Many other problems is consequences.
For example, i think, early or late, all 100% of PTFE spring washers inside the extruder shell will be broken. If your washer is half-broken, PTFE is still on place, but not vertically. And your filament have resistant force, so you have errors.
Only one way for now - change the extruder shell for new, its cheap.