My Iphone 4 keeps disconnecting to home Wi-Fi?

I have an Iphone 4 - ios 6
I would go connect to my home Wi-Fi as I lock my screen it would ALWAYS go back to 3g. When I have to connect again I would always have to retype the 27 letter and number password and that sucks. I do that 18 times a day… Is there a way I can fix this? My moms phone is the 3d generation and hers does not disconnect it stays. I tried the forget all network thing like 8 times it does not help.

Change your Wi-Fi channel settings on your router, if its on automatic change it to channel 9. Then reconnect your iPhone.

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