I had to run to a town meeting the other night. On the way there, the radio ran fine with no problems and I also was listening to songs from a memory card. After the meeting, on my way home when I tried to play the radio, it was sort of stuck or frozen displaying a local FM radio station and frequency with no sound. I hit the radio button, and was able to hear a station on AM and then station 1 on XM. When I hit it again, it was back to FM at the same FM station with no sound. I tried to change the frequency but it was stuck and would not change channels. I then tried to play some music from the memory card. It acted as if there wasn't even a memory card in the slot. The next morning, it was running fine. Is this a sign of impending failure?