ever since my S3 received the JB update last month, my phone is crap when it comes to GPS and navigation. And it worked very well before that. I have done a factory reset, and this did not resolve the issue. now when I turn on the GPS, and attempt to use google maps navigation, it constantly loses signal and also always shows me on different road, etc. plus the screen flickers or flashes as the screen moves during turn by turn, which it never did before. it has basically made it totally unusable for navigation. Has anyone else experienced this? I've done some looking around and can't find anything concrete on it. If I can't get this fixed, its either going back to verizon for them to fix, or i'm going to root it and load cm10(if thats available for my phone).