The Sirius on my '13 S5 exhibited the same problem 2 months after delivery when I took a 3200 mile trip for Xmas back in '12. Upon my return - which dovetailed nicely with the initial 5K service - I brought this to the attention of the dealer who could not locally replicate the problem. Found a spot less than 5 miles down the road and returned and took the Service Manager out for a ride. We then took a new S5 off the lot and drove the same course, with no issues. They replaced the Sirius tuner module and the cut-outs seemed less frequent, however there still were a few spots with intermediate loss. This past Thanksgiving took the same trip as back in '12, but instead of travelling thru the middle of the country, started heading down I-81 to catch I-40. After about 4 hours of intermittent losses ... much the same as I experienced with the original module ... I just listened to the jukebox and haven't tried Sirius since. There was also a thread on this about 2-1/2 years ago or so where someone from Sirius came on the forum and asked for those who complained to contact them, but I don't think this ever amounted to anything. Yours is not an isolated observation.