HT4628 MacBook Pro connection timeout.

I'm running Lion on my MBP version 10.7.5 and I can't connect to my friend's wifi. Every time I try to connect it reads a connection timeout. I can connect to every other wifi network I try but his. I can connect with my iPod and his entire family with their devices but not my MBP. I've read other forums and tried everything. I've done Ethernet and it works fine. I've set my network priority to wifi and even manually set his. I've done the custom location thing and all of that but no luck no matter what I do. I need help.

In support of Nykki, we have same issue with connection timeout.  Have trawled the support here and on others and in summary:
Macbook Pro on 10.7.5 software is up to date.
It doesn't always do it - I'm posting from the notebook now.
It hasn't always done it, problem started in last 2 weeks and my daughter with a 13 inch Macbook has the same intermittent problem since two months.
No, it's not helpful to suggest changing routers or blaming firmware on the router - my iphone, ipod touch, kids' imac, wife's ipad and an Apple TV3 all work fine.   If one more Apple worker or Apple fan suggests the problem is somewhere other than on my MacBook Pro I'll scream.
Sometimes it manages to connect if I do a shutdown-restart on the notebook.
Yes, I have tried the tricks with deleting the wireless networks using KeyChain access, did not work.
Has Apple itself actually acknowledged this issue - there are thousands of search hits on the topic?

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