Today was the first time I had a chance to fly my plane since I got it back from the avionics shop and #1 com would stop recieving for about 30* in turn when the broadcasting station was off my tail and #2 com would do exactly the same thing but off the nose. The DME seemed to be working ok but the kts wasn't registering but about 25 kts. on my KNS80 even though GPS said 125 mph g/s.