I have an issue that has been going on for the last couple of months. I have WiFi turned off when not in range of WiFi. Unlock phone and it will show my 4G signal fine. Out in open, not around anything, and signal is good. Then, sometimes, when I launch Facebook, the 4G indicator goes away completely (not replaced with 3G, 1X, etc) and Facebook says Signal Lost. Only happens in Facebook. Can launch other apps that require connection and have no issues with those. Anyone else seen this before? Any resolutions or is it just a "bug" I have to live with? All input or thoughts appreciated! The phone is not rooted and is running Juice Defender and Watchdog. Thanks.