apache crash on vps

Hi I have 2 VPS systems which webserver crashes after about two weeks.
I remember reading similar events with other users.

in the log I see:
Oct 17 04:02:02 remigius syslogd 1.4.1: restart.
Oct 17 04:02:13 remigius logrotate: ALERT exited abnormally with [1]

After but not always immediately the Apache will crash and 1 apache process will hang.
After I kill the 1 process, Apache will boot again.
Both VPS's run in PV

Do you have any ideas why this is happening?
Thank you

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Comments

Not off the top of my head, sorry ..

Is the system perhaps low on RAM?

You might have to ask some xen-specific experts about this. I haven't seen this kind of error myself .. or heard anyone else report it.