I have been having the same issue. Mostly when I have the blue tooth on. Every time it tries to sync it crashes the computer. Also I activated the Sprint system and the internet works but it locks up for up to 5 min. at a time.
Also my GPS works but is not very smooth. or accurate. I think something is wrong but I don't know where to start.
Another problem I have is the Aux. input for hooking up my ipod, if I select the input line on the system I get a bad whine in the speakers before I even plug in the cable? I am not very happy with the system at all.
