I have a 2009 RR FS Supercharged. About 10 months ago I had issues with an intermittent nav failure with an error notice stating that the installed DVD was not a nav disc. Then the seat memory started to fail. I had to repeatedly reset the seat memory then several days later it was gone. The dealer had to reprogram the truck with the right headlamp disconnected in order to correct the problem. For 10 months I had no problems. It started again. Now, along with the nav failure the bluetooth button on the steering wheel does not work. The dealer replaced the right front light module. It solved the problem for 24 hours. Now we are replacing the Nav DVD. I am concerned about throwing parts at the problem and seeing if anything sticks. I now have $900 invested in this fix. Could this be the bluetooth module? Could this be a M.O.S.T. issue? Any thoughts?