I woke up early this morning to the smell of the aux. heat strips running full blast. Thermostat showed house at 3 degrees below set point and aux heat on. Climatemaster TT038 system with CXM board, about 8 years old. Checked system, found steady green light on cxm board, calls for stage 1 & 2 and fan, but compressor contactor was open. Suspecting a loose electrical connection, i started lightly tapping some of the components. When i tapped the top of the compressor relay on the cxm board, the contactor immediately closed and the compressor started normally. Compressor ran for around 10 minutes and then the contactor opened, again no lock out code and thermostat still calling for stage 1 & 2 heat. Tapping the compressor relay got things going again. Unit has since run for several hours without and more trouble and has cycled on/off several times. I'm thinking bad/pitted contacts in the compressor relay on the cxm board? Anyone have similar experience?