mobile

Hey guys. Long-time lurker here. Usually try to solve my problems on my own but.... I'm at a complete loss here. I have a Galaxy S5. I was running stock rooted 4.4.4 earlier today. Suddenly, in the middle of the day, I was completely unable to access the internet in any way. Both data and Wi-Fi were non-functioning. They showed up as connected, but I couldn't access anything using either. When I got home I decided I'd try to update to lollipop, see if that would fix it. So I used Odin to flash to 5.0. The problem still has not been resolved. It's actually worse now. My signal goes on and off indefinitely. I have no idea what to do; I've tried everything I know to try.