Hi my 05 FX35, has started "beeping" every few seconds, with the key on and while driving down the road. i finally figured out if i lock the doors the beeping stops, but as soon as they are unlocked, it starts beeping again, anybody ever had this problem and what was the fix? I have checked all doors,and liftgate they are shut and there are no warning lights on the dash. Also are the doors suppose to lock once it is in drive, then unlock when put back into park? They are not doing that and i cant remember if they ever did. Any help would be great, as this is getting annoying.