Sandel loses gyro when transmitting on Com 2 (430)

Cirrus SR-20 #311 delivered by Luke Lysen. Plane far exceeds my expectations - I am absolutely delighted - more on this later.

Fuel flow gauge intermittantly goes dead. More importantly, Luke noticed that when we transmit on Com 2, a GNS430 (C package), after about 10 seconds, the Sandel has a problem. The screen turns orange and we get an “invalid” on the gyro - the heading at the top gets crossed out. If we stop transmitting, the Sandel wobbles around a bit, then “finds” the gyro signal and starts working again - anyone ever heard of this one?