I keep losing my wifi connection

Please help. I have been noticing my wireless router going in and out very often, at least once a day sometimes up to 5 times a day. I called WOW (Wide Open West) and had a technician come out and run tests and he said there was no problem. This is a brand new router and was bought about a month ago. My last router was the NETGEAR Super G wireless router and was having the same problem so I thought it was the router then. I have 1 desktop and 1 Macbook running off it often. I am also using XBOX Live and I get kicked off games very often. I play Call Of Duty Modern warfare 2 everyday for a couple hours each day and expierience this also every match. I will lag for about 15 seconds EVERY single match, usually in the middle of the match. Also, when I use my Mac laptop, out of nowhere the wireless icon on the top will go gray (meaning no wifi) and then 5 seconds later turn black, and back to gray and over and over again until i turn off my router and turned it back on. My mother also plays that Farmville Facebook game all day. I was thinking it her bogging down the connection with Farmville, but it happens when nobody is using any computer. I have watched the Green Wireless status light when I lose wifi and I see the wireless icon flickering, which I'm guessing isnt supposed to happen. I tried to call Netgears customer support but of course you have to pay before you can speak to anybody. I really appreciate anybody who reads this, and help could be greatly appreciated. Thank you very much.