I have a USB 760, have used mobile broadband for my home computer connection for over two years. Generally, I get 2 bars where I live. however for the last several days the signal fluctuates anywhere from 3 bars to none, and flips between mobile broadband and National access. These changes in signal strength happen within seconds accept when the signal is degraded it stays there for several minutes. This causes websites to time out, and makes for slow up and download speeds. I have tried reactivating the device and updating software. The tower where my signal comes from is in Ridge, MD, according to my wirelss bill. What gives?