Anyone have issues with an STEC autopilot? I have an STEC-55X in my plane and it's causing some issues. The plane is new to me and wasn't flown much before I bought it, so I'm ironing out the squawks. If I engage HDG or NAV + ALT and the plane is already on steering, it will hold altitude and heading for a while. If it has to make a steering correction, it will get into an oscillation and then turn on with "FAIL" listed on the Alerter page. I can reengage it and it will do the same, but then the system will finally display fail and not work unless I cycle power. Does anyone know the cause of this and is there anything I can troubleshoot before taking it to an avionics shop (which is a ways away)? Thanks!