The avionics shop determined that a bad trim servo is killing my autopilots. (They just had another plane with the same problem.) They sent the plane to Airways to have the servo replaced. According to Airways Cirrus does not have the part in stock and it is on back order. No estimate on when it will be available.
ask them to pull one from ‘production’!
We just had our annual completed on our SR20 and one of the squawks was a squelch sound coming over the headsets whenever the elevator servo from the AP was active. Turns out it was a poor terminal connection at the servo and a simple fix. Good luck.