I am a newbie here, but will try to help. I've looked into this and find that you are not alone. I see that you found ipconfig/release fix. Have you tried updating the routers firmware? This might do the trick,you can download through the manufacturers website. One more thing to try would be a hard reset of the HTC. I hope this helps, if not please get back to us, there are plenty of members more qualified than me to help you.
Edited by Nutloaf, 24 February 2012 - 04:40 PM.