I've read reports of people saying enabling TKIP encryption seems to help their phone work, but I experienced the opposite. Only when using AES am I able to get Wi-Fi working. When I enable TKIP on my router's settings page, my phone's Wi-Fi goes dead until I change it to Open or AES.
Weird, right?
Also, at school using my university's thousand-dollar routers, I have no problem, and it's encrypted with TKIP + AES.
Yet, at home, even with AES, my Wi-Fi signal seems to stall and quit sporadically, without cause. ALL other devices work fine (netbook, iPod touch, TV, Wii, etc.)
Very suspicious imo!