My runtime statistics on UM2Go is 350h of printing. But feeder skipping issue starts earlier.
I print for 16h daily, so changing PTFE coupler too often is not an option for me (but maybe it is necessary). I think I got spare parts included in my GO package from distributor.
The little blobby disk in the bowden is likely causing the extra friction making it difficult to move the material forwards or backwards.
In this case, you should actually move the material forwards, cut off the little deformed disk part and THEN rewind the material.
The usual cause of these evil disks is often the PTFE has developed a lip/cavity, or something is not seated flush between the hotend system (brass tube, PTFE and bowden)
How long have you been printing on the Go? it might simply be time to change out the PTFE. I would recommend the new ones from the + if you have a choice.
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