You might be dropping your voltage from the ADON board to the CCBN board in the same spot every time . I've had to replace 2 travelers on 2 new jobs already. It doesn't sound right but check it . Next time the problem occurs don't move the car and kill the power. Start ringing out your travelers by ground in one wire at a time at the ADON and ringing the same wire at the CCBN on top of the car. Good place to start is your car gate , I believe on XC1 ADON and XT1 CCBN. Ultimately you'll need a print. Also see if your getting a 0021 error <--open safety circuit example "car gate" good luck !!
