In the end, when on a hosting contract, you get the amount of queries you pay for.
You have exceeded the number of queries for the user assigned to the DB for what ever the period of time the host has set. usually an hour.
to quote the good Dr.
the following link will show you how to set up rotating users to multiply that number(a common approach used by lower-quality hosting companies so they can load up more accounts on one server and line their pockets with the hosting fees, rather than tuning their servers more efficiently)
http://www.zen-cart.com/forum/showth...ating+DB+users



