Lumia 820's touchscreen is jittery after update to...

So I have a Lumia 820 that used to run WP 8.1 Dev Preview. The scrolling and the Word Flow keyboard were absolutely perfect while the phone was running WP8.1 Dev Preview.
A few days ago I updated the phone software to Lumia Cyan and since then I've noticed that sometimes -- just sometimes -- the touchscreen becomes all jittery. This is most obvious in the operation of the Word Flow keyboard -- occasionally words don't register at all and the swipe pattern becomes jagged, as opposed to a smooth swipe during normal operation. Also, the screen jitters when I zoom in and scroll on an image or in an app.
I've noticed the issue becomes rather more pronounced when the phone is charging. It's not a deal-breaker or anything, but it's curious nonetheless.
Is there any way I can fix this?
Attachments:
wp_ss_20140902_0003[1].png ‏45 KB

This problem seems to appear and disappear all by itself.

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Attachments:
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