zram swap instability

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http://unix.stackexchange.com – I use Mint 13 Maya with mainline kernel 3.6.3 for Ubuntu Quantal on my Asus P53E Notebook. I use zram swap that comes with the package zram-config. I've noticed that using it the system to hangs at random moments, especially (but not always) under high memory loads. Even when 90% of memory is free (and exactly no swap in use) the notebook cannot survive in a powered state a night (8 hours). This "hanging" behaviour is quite literal: the computer respond to exactly nothing. No mouse movement, capslock/numlock leds don't respond to the corresponding keys. Even the sysrq combinations don't wor (HowTos)