Why does my Iphone get dropped from my Wi-Fi connection?

I have a DLink n300 router and I have 4gs iphone. I can get connected to the Wi-Fi for about 10min and then it drops and goes back to 4g. I didn't have this problem with my old Linksys G router. Everything else that connects to the router wireless doesn't drop. Anyone have any suggestions on how to fix this and no I'm not going to buy a new router, this one works great with everything else.

Another router in the area on the same channel.don't use auto for the channel. It defaults to 1st channel and sticks there.read this page.

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