General wifi not working--and it has been fine for 6 weeks

Hi,

My wifi has always been fine. For 6 weeks it has flawlessly connected every time I come home. Today, however, it won't work.

It says that it is connected. It says that the signal strength is excellent.

However, I can't get "out".

I went to a coffee shop and it connected just fine. I came home AND IT CONNECTED JUST FINE.

Then it stopped again.

I've reset and pulled and tweaked everything I know to tweak.

Ideas?

Thanks,
Biz