wifi keeps disconnecting

wth the ios 6 update no my wifi keeps disconnecting. i can now utilize wifi any longer it just bounces off and then takes nearly forever to connect to a website without it. or if i turn it off and use the cellular network it works good. i want to use wifi while in my home. i have a good wifi connection for all other devices. please help or suggeset stuff. i have already turned it off and back on, i have done forget this network and retyped in the networks password for wifi and reset the phone. but still nothing works. i had no issues before the ios 5 update now i have issues.