Help HTC Desire Z freezes when WiFi is turned on

[Falleneyed]

Hello there. Well I just registered because I've got a huge problem with my phone. Every time I turn my WiFi it completely freezes after a minute or so. I literally can't do anything with it, not a single button is working including the power button so I have to remove my battery in order to restart it. At one point it got stuck in a boot loop but I managed to get over it by going back to factory settings, I don't know if that matters or not. I really hope one of you could help me one with this one