Well, it took a few days of waiting for more conducive weather, but fully back in service.
U-Bolts that clamp mast in rotor were loose enough to rattle! All tightened and double-nutted to hopefully prevent a recurrence.
Clamp that locks mast in rotor is loose, allowing mast and antennas to windmill slightly - just enough to lose sync with controller.
Tower is nested and a rope tied from end of boom to house to stop spinning. Big storm coming tomorrow night that will delay chance to fix.
Guess it is time to drill and pin the mast in the rotor clamp.