The one from last summer was not intermittent, each time Trane made a recommendation we would do that and attempt to start the compressor. At least 8 or 10 times in a week period and every time the contactor would pop in and out in less than 1 second. So far i have only tried to start the current one, one time with same symptoms.
I guess it is possible that Trane logic would see a phase imbalance as phase reversal. All connections were tightened on Friday prior to the attempted start. The contacts in the contactor look in fair to good condition to me.