DON't do a master reset--you will have to do a bunch of 'autopilot training' work over, and it won't fix the problem.
DO crawl back and check out the RF unit--the linkage could be loose, or the mounting has come adrift. Also check the wiring
to the junction box.
Its also possible that the RF unit is failing--they do wear out--but my own experience has been that they get 'twitchy', where the indicated rudder angle jumps around. If the indicated angle stays constant when you turn the wheel
, its a good probability that the linkage is broken.