Un-dismissable nextruder main plate warning / intermittent stuck filament error - connected ?  

Un-dismissable nextruder main plate warning / intermittent stuck filament error - connected ?

I have what I think are two problems, but may actually come down to one...

About six weeks ago, I got the "stuck filament" error reported by others, indicating that the filament sensor on the Nextruder had failed to register that the filament had been retracted. After opening the doors, I did see a bit of mangled PETG filament, so:

1) I  pulled it out gently with a plier

2) Blew compressed air to remove any remaining debris

3) Ran the gear check calibration test 

This seemed to solve the problem. However, for every print I have run after that, I have seen the following warning after my print concludes:

There doesn't seem to be a way to clear this warning - I see it every time a print runs.

This would be a minor annoyance, but since that time I have had the issue with the stuck filament twice more, which makes me wonder if the warning indicates something deeper that I don't see.

My questions are:

1) Is there  a way to dismiss this warning ?

2) What could be causing the filament to be stuck intermittently ? This doesn't happen with every print, but does seem to be happening with increasing frequency.