It seems that the Sirius XM receiver in my 2007 XK convertible is the cause of intermittently losing the signal. Everything else seems to have been checked. Used units run $50-180 on ebay. Physically swapping seems simple enough in the trunk/boot. However, though I would need to call Sirius to update the number on the unit, I heard that Jaguar needs to resync the unit to the car. Can anyone advise?