For me when I switched it stopped the restart problem but it also helps battery life, signal, etc. You just have to play around with which radio works best in the area of the country you live in. Here's the post that has a listing of which are better for where.
http://forum.ppcgeeks.com/showthread.php?t=56611
I switched from the 1.03.03v that had the gps problem to 1.03.09v that didn't for me.