Unfortunately, I've lately noticed that problem and the touch response of my 1.5-year-old P3 is awful and I cannot even pick my song. Which is what I mostly intend to when I'm using my P3. Anyways, I don't know if that is a coincidence or anything, but when I upgraded my P3 from Touch 6C to 6D, I've noticed the touchscreen was a bit smoother. But then, ugh, dead areas of the touchscreen started to appear. And in a desperate attempt to save it, I'll probably try and format it... But it seems like it's a hardware defect, so I don't expect anything miraculous.
I think I'm going to use my old YP-T7F back, it never failed (until now) and I've been owning it for several years