Sensation issue
My own HTC sensation is also experiencing the problems described in this thread. It started a week after I got the phone. Unlocking the touchscreen with a soft swift motion stopped working properly and I also experience issues with typing and sometimes with browsing trough the widgets. Its the worsed when the phone is lying on a flat surface. It doesnt matter how hard, soft, fast, or slow I press or swipe, the unlockring just responds choppy. I also noticed I can't use the fast rotating carousel function on my Sensation anymore. I just can't make the carousel rotate fast enough to switch to the small spinning version.
When I hold the phone in my hand it does work better, but still with some issues described above. I've tried a soft reset and hard reset. It fixed the issue for a few days but eventually came back and this time won't go away with any reset. I'm very curious to when HTC wil come with an official message to fix the problem.