Cursor jumps when typing in all applications

As I type, in any application, the cursor jumps up and inserts itself into a line several lines above. It happens in Mail, Gmail, Pages, Notes, Text/Edit, Microsoft Word, and as I type this document. The problem has existed from when I first got the MacBook a month ago, and continues despite numerous suggested fixes by Apple Care. In addition to the trackpad I use a wireless optical mouse with the nano receiver plugged into computer’s USB port. Earlier I had the mouse in a USB hub; I stopped using the hub. No phones or electronic devices are close to the computer.
When typing I don’t touch the trackpad, but the heel of both hands hovers over its top right and left corners.
The cursor was jumping before I installed Office for Mac, and after it was un-installed during two OS re-installations; MS Word does not seem not to be the culprit. The problem is frequent but intermittent, and hard to isolate or find a trigger. Although not constant, it is distracting and time-consuming to untangle an affected paragraph. I need to use a mouse when typing, but also like to have the trackpad for scrolling and changing documents.
On the advice of Apple advisors, I have:
Erased and re-installed OS 10.9.5 (twice).
Re-installed Pages, Numbers, Keynote.
Re-installed Office for Mac (twice).
Rebooted in safe mode.
Re-set PRAM and cleaned out RAM.
Repeatedly disabled/re-enabled trackpad. (SysPref>Accessibility), trying to isolate issue.
Tried using another mouse.
Tried using trackpad only, no mouse.
Tried changing fonts.
Monitored my typing to see if I am brushing any odd combination of keys (I type fast but make errors).
Could it be a conflict between mouse and trackpad? Am I mistakenly hitting an odd key or key combination? Could it be related to the heat of my hands hovering over trackpad? Grateful for anything that leads to a solution.
MacBook Pro (mid-2014), Retina display. OS 10.9.5 fully updated. 16GB RAM, 512 GB Flash

I had the same problem. Visit http://support.toshiba-tro.de/KB0/TSB4700HI0007R01.htm and you'll find the solution. I hope so.
mihailbs

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Cursor jumps when typing

I see a bit of chatter on this here and on the web, but no solutions that I can find.
When typing in a document, in wordpad for instance, the cursor (and text entry point) will suddenly jump elsewhere. Typically up a couple of lines. Since it happens while typing, I end up corrupting the document.
Disabling the touch pad does not solve the problem.
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Solved!
Go to Solution.

Just throwing a thought into the pot; I note that the touchpad has been turned off and the cursor is still "jumping", is the press to select function for the trackpoint also turned off?
Andy ______________________________________
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Cursor Jumps when typing an email reply

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