This "bug" just happened to mine too. I had left the 770 unattended for a few months and when I finally picked it up again it started doing this. I now have "trouble" at times connecting to my AP's at home and at work. Nothing has changed in either of them, same routers, etc... Someone also mentioned "power problem." My 770 doesn't last as long in stand by these days, nowhere near 24 hours. Maybe that's related, I don't know.