Hey everyone..My wife and I recently switched from Sprint to AT&T and I purchased an unlocked M8 from Amazon. Brand new, never opened and really a bad a$$ phone! I am having a really weird issue with it. Took the phone to AT&T, they placed a SIM card in it and I was out the door. Went home and connected to Wi-Fi so I could download my apps from Google Play. The next morning, I left for work and noticed I had no data at all. Phone and text worked, but no data. Went into settings and it said "disconnected" under data. After about 3 hours or so, I looked and had data back. I returned the phone and was sent a second Brand New phone. This one is doing the exact same thing. When I disconnect from WiFi, it takes roughly 3-5 hours for data to come back. I went to AT&T and received a new SIM card and that did nothing. I have googled and seen where this has happened to others but I can't seem to find a fix. Any info/help would be greatly appreciated. This is getting so frustrating. 
