Nexus 7 2013 odd touch screen jumping

I have been using my new Google Nexus 7 (2013 edition) for a couple of months now and I have noticed an odd glitch where using two fingers to zoom on a web page or document caused erratic behaviour, like the home button being pressed or text being highlighted.

I downloaded a touch screen test app and this picture shows normal operation of the multi-touch interface:

As can be seen, two fingers are recognised properly and the zooming functionality works like a charm.

However, after a period of usage, the phenomenon described above starts to occur and the tester can show what is happening:

Screenshot_2014-06-29-16-37-59Only two fingers are on the screen!

Cleaning the screen does seem to reduce this effect. Please comment below for any suggestions!


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