definitely, mine has been doing the same. Lately it's been pushing random buttons of it's own accord... it's possessed or something! It used to freak out when I touched the screen, but now it does this whenever it pleases-- sometimes I just have to turn the whole thing off, so it doesn't end up calling all of my contacts while I am trying to charge it over-night.
I really don't get it.
For now, I'm just assuming that it's possessed.