Happens to me too. Minutes after booting.  I found a workaround though ( so at 
least the laptop is usable again) install ubuntu-tweak . And use it to make the 
font smaller. 0.9 restores some of the characters and 0.8 size restores them 
all. 
Been working fine for hours now.

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You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to xserver-xorg-video-intel in Ubuntu.
https://bugs.launchpad.net/bugs/1342675

Title:
  Random characters in screen text suddenly disappear

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