My 2011 535i factory installed satellite radio is having longer periods of no satellite signal. Always in the same areas. Other cars with satellite have no problems. Dealer tested radio and said it was OK. Replaced shark fin antenna at my request---only very slightly better. Could this be a tuner problem. I took to independent audio store to install an aftermarket antenna, but he couldn't find the antenna connection in the tuner
Sept 2015--now cuts out in new locations for several minutes
Sept 2015--now cuts out in new locations for several minutes