Last weekend the site was down due to some problems with Bluehost. Occasionally the database goes down due to excessive data traffic and I had built in a function that sent me a mail when that happened. They saw my site sending too much mail and concluded that it was a spammer. Never mind that I had informed them before why I sometimes sent a lot of mail. Obviously their organizational memory isn't that great.
In the meantime I haven't solved the problem of the occasional downtime for the database. Fortunately not all data are in the database so that the visitor gets at least something when the database is down.