Strange Database Error

[Flying Drupalist]

Hello, I keep on getting the following database error:

Database Error: Table 'ads.smf_boards' doesn't exist
File: /home/public_html/SSI.php
Line: 1292Database Error: Table 'ads.smf_sessions' doesn't exist
File: /home/public_html/Sources/Load.php

Line: 2073

Now this is very odd error. When it appears it hides the rest of the page, but it doesn't always occur. Refreshing usually gets rid of it. The error appears about 1/5th of the time.

[Flying Drupalist]

Damn, can this be moved to general support?