This is my scenario:

I part in the lower level of a 3 story parking structure at work. Of course when I start my car I have no gps signal. Music from radio starts and I leave work. Withing 20 seconds or so gps is back at full strength. If I select a POI and do the route it reboots but music keeps playing. Then I do it again and it does the calculating route and is fine. If I cancel route it reboots again.

I have repeated this 3 days in a row. Each time after it works as well. If I am at home or someplace where I am not in covered parking it hasn't done it. I was using GTIMatt's mod and just recently switched to CMH928. I don't think it is the mod but was wondering if anyone else has had this weird experience coming out of a garage?