I have the same thing happen to mine occasionally. I usually pull he shell plate clean the powder off, and then put grease back on. I use bel ray waterproof grease for dirt bikes since I have a giant tube. I don’t think it matters though as long as it sticks. I also grease the rubber nub that rotates the case feeder block. I found without grease that would wear a flat spot in the nub and be rough to engage. Sent from my iPhone using Tapatalk Pro