In case its relevant there was a similar symptom discussed on the mailing list
https://lists.launchpad.net/ubuntu-phone/msg19236.html
"When the phone is being charged, the screen touch becomes super sensitive, a 
touch that would ordinarily type one character, may type a few to several 
characters, windows, tabs etc do not respond correctly.."

This was attributed to faulty ground in a charger or bad USB cable. So
if this was seen while plugged into something it could be related. "We
are in knowledge of this HW issue that affected some chargers that had a
bad behaviour with the screen tactility when is plugged"

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https://bugs.launchpad.net/bugs/1386767

Title:
  single tap causes many letters sometimes

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