500 Internal server error when recalculating reviews

URL to your eFiction: www.mjfiction.com
Version of eFiction: 3.5.3
Have you bridged eFiction, if so with what?: n/a
Version of PHP: 5.5
Version of MySQL: I can't find this information. I'm using DreamHost and their admin panel is confusing.
Have you searched for your problem: Yes
If so, what terms did you try: internal server error recalculating reviews
State the nature of your problem: When I try to recalculate reviews from the admin panel, I get a '500 Internal Server' error. Recalculating stories works fine. Since the first time trying to recalculate reviews the other day, some stories appear to now have 0 reviews, but when you click on the actual story, the reviews they had before are still there.