Has anyone else experienced this issue when connecting to 4G? For the first 3 or 4 days I had my Epic it was connecting to 4G just fine, especially while driving along Beltway 8 in Houston. Now for some reason it won't appear to pull a 4G signal and just says "Unknown" when I click to turn on 4G. (In this pic I am connected over Wifi so 4G shouldn't be connecting, however it is the same when not on wifi).