At least once a week, any DreamHost site of mine that runs WordPress loads with error 503:
Service Temporarily Unavailable
The server is temporarily unable to service your request due to maintenance downtime or capacity problems. Please try again later.
These are low-trafficked sites with daily hits in the double digits. I have tried installing a cache plugin, disabling all plugins, and deleting all plugins, all to no avail. I don't know what the problem could be, or if it's on my end or DreamHost's. Any thoughts? I am running WordPress 2.7.1 and PHP 5.2.6.