Clements

I was on a flight today from LFPG to CYVR. I was about 7 hours into the flight when I noticed my aircraft was veering off course on auto-pilot...it was not following the route. When I tried to manually select a heading, the button animated but the system did not respond (the aircraft stayed in managed mode). I tried to disconnect the autopilot. Same thing. I tried with the autopilot disconnect on my throttle. Same thing. Interesting, my POV hat allowed me to change my view, but nothing happened when I interacted with the buttons, controls, etc. Have others experienced this problem? Is there a solution? Is there some way to troubleshoot this? I hate to invest in a long haul flight only to have to abort because the plane won't respond.