I have the standard at&t uverse router with a 12/2 plan. Previously, everything worked fine with the reception as well as speed. About 18 hours ago, the reception in my room, which is separated by ONE wall from the office where the router is, practically disappeared. I power cycled router and restarted my computer. Both my phone and computer will not pick up the wifi in my room. I changed the channel, still no connection. Factory reset router, and then changed channel, still one bar. My phone shows 5 bars when right next to the router, down to 2 less than 10 feet away. How can I restore the strength of the signal?