Yes, was having trouble with wifi, and it was maddening. I would connect to the wifi signal at home but say internet unavailable. I found two things that seemed to help:
1. First, configure the wifi adapter properties and turn off power saving.
2. On your router reserve the IP address the laptop's wireless connection uses so it is always the same, Then, manually set the IP address that the laptop uses on the laptop to the same thing.
This is my wife's computer so it is not in front of me. Will post some screen shots or links when I get around to it, and it is not in use.