I just returned from a 2000 mile trip during which my (new to me) 2011 R1200RT performed flawlessly. After parking in my garage, I noticed a single, high-pitched beep every 30 seconds. The only thing that stopped it was disconnecting the battery--after 15 minutes the beeps stopped. A few hours after re-connecting the battery, the beeps returned. The batteries in the DWA box are good, as are the fob batteries. Does anyone know what this is & how to fix it?