I have an NP770Z7E, and I was having pretty much the same problems with the same wireless card. I don't know if this has already been mentioned, but I found that if I disabled 802.11n mode, I had no problems. That of course will limit your internet speed depending on your maximum speed, but I still get around 20Mbps with 802.11n disabled. Just go to device manager > network adapters > centrino 6235 > properties > advanced settings. Don't know if that'll help you, but it worked for me.
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