The bottom of my AMS is warped. I was printing a fairly complex 4 color model when I started having problems retracing the filament between colors. I tried “retry” again and again until it finally stopped responding. Frustrated I dismantled the AMS to inspect the internals. Nothing seemed to be amiss. So I reassembled and started to insert the spools when I noticed the AMS rocking back and forth. Evidently the internal hub motor got hot and distended the bottom of the AMS case. I am building some pads to raise the AMS to insure greater stability and cooling under the case. We will see if that eliminates the problem.