My store randomly goes into maintenance mode. How can I stop it from doing this? It's happened 3 times in one week.
My suggestion to create staging system for you instance. Enable the Magento Error log print from Backend .
If it it create YourMagentoDir/var/system.log and YOurMagentoDir/var/exception.log then must be some issue in your instance. and s start Debugging the System by follow Fundamentals for debugging a Magento store.
If this debug is not given solution then it might be server site issue.