I have a K2 Plus and two CFS units.
Extrusion is starting to be an issue, with extruder jams and numerous feed error messages. I read, a few months ago, about cutting a spring or two that reduced or even solved the issue, but cant find the details. Anyone?
Dont cut, i am currently having issues my self. But that is not the fix. There was an update that fixed that.
All updates have been applied! Still happening 
The link is here : https://youtu.be/t1PL2Zw09Y4
It does work, ive had heaps of people do it. However Creality DOES NOT recommend you do it, so do it at your own risk.