Start being honest with your customers.
The "unspecified error" your server keeps having every hour or so is obviously your way to try to force users to stop using the "free" version of aol which you advertised and agreed to provide them at the time.
Could you please message us on Twitter at @AOLSupportHelp or on Facebook at AOL Customer Care? We'd like to look more into the issue you're experiencing. In case you do not have a social media account, we are also available at: https://help.aol.com/contact/
Looking forward to your reply!
JOSEPH WEBB commented
The idea I expressed is itself my comment.