Hi Matthew,
Sounds weird, is the swap partition properly setup?
You can see the amount of swap that is setup/user using either the top or the free command.
The total column for swap in the output of those commands should not be 0.
You can also check if swap is used by running:
swapon -s
If swap is not properly setup then as soon as your host runs out of memory it can only crash an application in order to get more memory.
If you have a swap partition (let's take sda2 here as an example), then you first have to prepare it:
mkswap /dev/sda2
and you can enable it using swapon:
swapon /dev/sda2
For this after a reboot to be used again, you'll have to add it to the /etc/fstab file like:
/dev/sda2 swap swap defaults 0 0
Hope this helps,
--
Wil
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