I've been having issues with AME simply stopping to render. The Elapsed and Remaining read outs remain frozen. I checked in the activity moitor and saw that the aerendercore stops responding. I've been able to get it to continue the render by killing the aerendercore in the activity monitor, and it seems to continue where it left off, with updated Elapsed and Remaining readouts. I'll have to see if the render was successful with that method.
This problem doesnt happen every time, so not sure what is causing it.