I've had a Dell Inspiron laptop with Windows 7 for about a year or so and it always had the same problem. Very often, if I am connected to a wireless network and I just close the lid (just putting the laptop to sleep, not shutting it down) and move somewhere else, like from home to school, Windows will tell me that any new network I am trying to access is unavailable. More specifically, the process is stuck in the "identifying" step forever. Using the troubleshoot problems option rarely works. Some other times, the issue will just resolve itself after a while. The only way to get my network connectivity back for sure is to restart my computer every time, which I am just tired of doing.
So, what do you think ? Any similar issues out there ?