Has anyone else had to reset their network settings after the 5.1 update? I've seen this problems on 3 phones now, two iPhone 4s and one iPhone 4S, all on AT&T. After the 5.1 update the phones weren't staying connected to the data network, whether it be 3G or "4G." After resetting the network settings that problem has gone away. However I still find myself having to restart my phone to get a good data connection, even though it shows 4G and full bars. Basically what will happen is my phone will seem pretty slow so I try a Speedtest. It is either very very slow or can't even start the test because it can't connect to a server. So then I restart my phone and run a test and it's actually getting very good speeds in the 3-5 Mbps area. Anyway, just wondering if anyone else is having this problem since the update.