Stepan Roucka, if the entire computer freezes it sounds like you may be encountering a kernel oops.
After the crash which forces you to restart, could you please attach the following and mention the day and time the crash occurs:
/var/log/Xorg.0.log.old
/var/log/kern.log.1
Stepan Roucka, if the entire computer freezes it sounds like you may be encountering a kernel oops.
After the crash which forces you to restart, could you please attach the following and mention the day and time the crash occurs: Xorg.0. log.old
/var/log/
/var/log/kern.log.1