I added the following to xorg:

Section "ServerLayout"
        Identifier "Configure Server"
        Option "AllowEmptyInput"        "false"
EndSection

This resulted in duplicated keystrokes and the frozen keyboard/mouse
problem still happened after a while.

In my case using an external mouse and the following grub command
options almost eradicate the problem (is only triggered after several
hours):  "idle=halt io_delay=none pci=routeirq clocksource=hpet"

-- 
[CX700] Mouse, keyboard, and power button freeze
https://bugs.launchpad.net/bugs/432178
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