Help WI FI problem after downloading upgrade

[htc desire advocate]

I downloaded the froyo upgrade 2 days ago and it seems to have stopped my wifi working. Its not a problem with the router as other devices work on the router. I also checked my desire on other wifi networks and there is no connection to the internet. I manually put in the ip address and the wifi icon comes up but still no link to the internet. When I use my3G mobile internet everything works so it can only be a bug with froyo upgrade. Can anyone help

 

[djbandit]

i have the opposite problem my 3g keeps going of if i reset the phone its ok for a while but then i goes again so any help on that would be good also