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bbfa235
(Get the code!)
Switching the X11 acceleration method from sna (default) to uxa by adding
Option "AccelMethod" "uxa"
to the Device section of /etc/X11/xorg.conf seems to have solved the problem, although (a) it's a bit hard to tell as the problem was/is intermittent, and (b) there is probably some performance cost to the switch (although it's not noticeable to me).