Random crashes of applications and freezing of whole system

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http://crunchbanglinux.org – Hi all. I'm running CrunchBang Waldorf and often an application crashes randomly or the whole system just freezes and can only be brought back by a hard reset. I seem to remember this kind of behaviour can be due to the RAM being broke / not working properly anymore, but I'm not sure if this is the case. Is there any way I can gain more insight into what exactly causes the crashes? I read up on log files and examined some logs in /var/log but I found no clues, or maybe I just don't know what to look for. Any help would be appreciated! (HowTos)