It happened once with me. I just placed a box with a pair of new loudspeakers on the wardrobe and forgot about it. Precisely near this wardrobe is where the compass for autopilot is mounted! Removed the box and everything was back to normal.
As promised I'm reporting on the successful resolution of the flux gate compass problem. I ran the recalibrate process with the autopilot and worked through the compass realignment process and all is well. As was suggested the process wasn't a big deal but was new to me.
I want to thank everyone who responded to me question with the wealth of information and things to check.
Giving money and power to politicians is like giving whiskey and car keys to teenage boys.