Hey guys yesterday as i was running my lathe (LB 15 5020L controller) and noticed that my rpms started varying. Basically it was speeding up and slowing down.I was boring my soft jaws so everything was in manual, I stopped the spindle when i noticed it and when i went to restart and got a 110 SDU alarm. I shut the machine down completly and restarted and everything worked fine for about three hours and then it alarmed out one other time in auto. Once again I shut it down and restarted then finished out the day with no troubles. Do any you guys have an idea of what might be going on?Im very much a novice on cnc stuff and any help would be greatly appreciated...