Evo clicks on its own. Is it virus??

[rajji_p]

Hi,
I recently got HTC EVO from best buy. After a day i updated it to Android2.2. If i remember correctly, the issue is started after upgrade.

Issue is :
When i use my phone for sometime continuously, after a while it works on its own. for example if i am browsing a webpage it clicks somewhere in the middle it goes back and forth, it scrolls up and down without my interaction. Or else if i am on home screen it traverse in between screents and it clicks somewhere. During that time i can't operate anything except power button. I will lock it and unlock so that i can use for some more time. Is it some sort of virus??
Surprisingly, over the weekend i was in Orlando on vacation. There it worked very well for almost 4 days, not even a single time this weird behaviour. Once i landed in Chicago the same issue started again.

Please suggest something.

Thanks