Many causes have been identified, from merely a trackball in need of cleaning (alcohol wipes run over it thoroughly) to a defective or damaged trackball assembly.
I'd start with a live battery pull, failing that, a good cleaning with alcohol wipes, failing that a factory data reset, failing that replacement of the phone.
If a rooted phone is doing that, I'd really suspect the trackball being dirty or damaged.. you say life of the phone.. was it malfunctioning before rooting?
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