FYI, just got this response from HTC:
"Hi, I'm Victor, and I will be glad to assist you today. At this time we are looking into the issue with the WiFi connection issue with the Evo 4G device. At this time we have no information about any updates that will be released to help resolve this issue. If an update is released for your device you will get a notification on your device that an update is available for it. It may also depend on how offer you have your accounts sync with your device as well if you do not have anything running on the device. You can charge your battery the following way to see if that helps improve the battery life on your device. 1. Connect the phone to the charger and charge the device until the LED turned green with the phone powered ON 2. Disconnect the phone, and power it off. 3. Reconnect the phone to the charger, and charged the device until the LED turns green again. 4. Disconnect the phone, power it on, and then power it off. 5. Reconnect the phone to the charger and charge until the LED turns green again. 6. Power on and use. If you have any other questions feel free to reply."
.........kind of a contorted battery fix....it did help. No wifi help.