mwoodling,
There's a high chance your maintenance windows are corrupted. As a stop gap you could shut down zenjobs. To start, I'd run a zenchkrels -x1 -r and then run zenfixit to see what comes up. Chances are this is something I'd have to look at interactively to help you with if the automated tools don't find an obvious problem.
Best,
--Shane Scott (Hackman238)