"Snort received signal 15, exiting"

[Stuart Grimshaw <stuart () smgsystems co uk>]

I keep getting the above error message when snort has been going for a while, 
does anyone have any idea what could be sending Snort a signal 15?
-- 

| Stuart Grimshaw <stuart () footballnet com>
| Chief Operations Officer
| Football Networks Ltd
|-
| t:07976 625221
| f:0870 7060260

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