SQL Server 2012数据库超时每两个月发布一次

We have a few SQL Server 2012 in our office. For this one, we have about 15 databases on it. Most of them are small, and used sparingly. A couple are for E-Commerce solutions, and others are for the bulk of our business and are pretty busy. The issue is that it seems that around every couple of months, for what appears to be no reason, the Dell server hosting this will have a PMS day, and performance will slow to a crawl. We have a few SQL Server 2012 in our office. Fo