[TheLastSuperman]

Some of these cron jobs are actually files it calls, .php files which contain sql that is run (depending on what cron, if within said file is supposed to run and such) so it could have been a query to remove all expired user sessions or similar or completely different. Please do as force suggested and ensure all files are in place.

Not sure why it should make apache restart unless the query simply made it lose its cool per say... seems odd or perhaps that something is not setup correctly in php.ini or other, if you're not on shared hosting then ask your host to look into this if on a shared server they will more than likely NOT modify php.ini or other pertinent settings as it would affect all clients on the "shared" server where as if on a vps or dedicated it can be done but that all depends on if its something related to that, like I said initially above I don't ever recall in all my years having someone report that cron jobs made their server restart (related to vB) looks as if it can happen though.