Firewall Randomly Turning Itself Off

My firewall on a new vps is turning itself off when I try to restart it doesn't work. I have to start a terminal session and issue the command service lfd restart and then it's fine for a while.

What could be causing this?

Thanks

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tail /var/log/lfd.logBe quick, before someone deletes my response. 

its probably OOM (out of memory)
ensure you've sufficient amount of free ram available during the peak time

That's what I thought. I only have 1G of ram on this VPS. Would increasing the swap from 1G to 2G help?

Thanks

yes but will impact the performance