When I’m typing in any application (e.g. Chrome, Safari, MS Word, Evernote), the insertion point often jumps around unexpectedly. I have this problem with the builtin trackpad and my magic trackpad at home. Caveat Since this is both a disease of the internal trackpad and the magic trackpad then it can't be the cable between the internal trackpad and the motherboard
My MBP has been for service once, I believe they changed a cable between the trackpad and motherboard. No dice. I have wiped the OS and reinstalled from scratch. I have booted in safe mode. You get the idea. I'm certain that most of the time I'm nowhere near the trackpad when it happens. (Like 10 seconds ago).
Is this hardware? Software? I must admit I don’t have a clue how to diagnose. My leaning is likely software.
MacBook Pro (Retina, 13-inch, Early 2015)
OS 10.12.5 (although this has been going on for over a year)