RB, this happened to me as well. Shut the whole wireless system down. Leave it off for 15-30 minutes. Then start it back up in the following order: 1. modem 2. router 3. everything else

This has to be done every few months. It just cleans out the whole system. For some reason after a few months it goes wacky. Don't ask me why it just does. It's a very common thing. I had this problem a few months ago and posted about it and many others on here have experienced it as well.

Hope that helps