Probable causes of vb_user table mysteriously disappearing?
 

Received a "Database Error" message this morning. Saw to right click to view the error. Mysql error said
"Table 'militas1_vbull1.vb_user' doesn't exist"

I logged into my phpmyadmin to see it really is missing.

I have not touched the database. What could cause a table to mysteriously be dropped?