Hi,
I´m printing since month and never had an issue with the AMS.
Since yesterday I now have issues with slot 4 only.
When loading it makes errible looud grinding noises fr some time, gets less and more again but actually works a time.
Nevertheless it ends in motor overload error after some time, after a restart it works shortly, again grinding and then stop… and so on.
I changes the filament to another slot - no issue.
Put another filament from a nother slot with now issues to slot 4 - grinding again.
So it seems to be an issue with the slot 4 only.
Here a short sequence of the sound:
Anyone a idea what to do?
Thanks in advance 
Michael