HTC One Touchscreen issues

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http://forums.androidcentral.com – Hi all, had a look and couldn't find any posts relating to this, so apologies if it's been addressed elsewhere. A couple of weeks back my HTC One started acting strangely. When at the lockscreen simply touching anywhere on the screen will unlock the phone, similarly, touching the camera app etc. will bring you to that app, there is no dragging required. Also when receiving a call a touch anywhere on the screen answers the call, no dragging required. Thought it might be some rogue setting but that seems unlikely. Brought it back to shop and they recommended a factory reset, or to wait (HowTos)