iPhone 3GS and Wi-fi Problems

I can connect to my home network fine using my D-Link router but once I leave and come back home, the 3GS will not connect to my wi-fi even though it shows in the setting that the network is there. It still shows the Edge icon and I have to reset my router in order to connect to the wi-fi again. Im curious if anyone else is experiencing this or if it may be my router or wireless settings.

Im using:

WPA
Cipher Type: TKIP
PSK/EAP: PSK