IPhone loses WiFi every few days

Hi. My iPhone 4S has been acting strange recently. Every few days or so my WiFi will stop working. It shows In the corner that it's connected but nothing that uses the Internet works. I go into Settings and turn WiFi off and on and it tries to connect but the wheel just spins next to the network name. Other devices in my house work fine during that time but the iPhone won't connect. Usually the only way I can get it working again is to reset my network settings on the phone.
I'm wondering if it's my router possibly? It's a Linksys WRT54G that we've had for a long time. I'm using WPA Personal. Could my router be getting too old? Ive also noticed lately that my WiFi strength goes from two to three bars quite a bit on the iPhone. I always had full bars in the past. My channel is on 11 but I tried to change it the other day which caused my Xbox to not connect so that's another reason I'm leaning toward the router being too old. But the fact that my phone can lose signal while everything else in my house is unaffected makes me feel like it could be the phone.
Any help would be appreciated!

Hi. My iPhone 4S has been acting strange recently. Every few days or so my WiFi will stop working. It shows In the corner that it's connected but nothing that uses the Internet works. I go into Settings and turn WiFi off and on and it tries to connect but the wheel just spins next to the network name. Other devices in my house work fine during that time but the iPhone won't connect. Usually the only way I can get it working again is to reset my network settings on the phone.
I'm wondering if it's my router possibly? It's a Linksys WRT54G that we've had for a long time. I'm using WPA Personal. Could my router be getting too old? Ive also noticed lately that my WiFi strength goes from two to three bars quite a bit on the iPhone. I always had full bars in the past. My channel is on 11 but I tried to change it the other day which caused my Xbox to not connect so that's another reason I'm leaning toward the router being too old. But the fact that my phone can lose signal while everything else in my house is unaffected makes me feel like it could be the phone.
Any help would be appreciated!

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    5/09/13 4:03:23.428 PM com.apple.launchd[1]: *** Shutdown logging is enabled. ***
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