I've been getting this alot....

[trenchteam]

Connection Problems
Sorry, SMF was unable to connect to the database. This may be caused by the server being busy. Please try again later.

Is this really my server, or is it caused by modifications on the site.  Since I started custom mods, this has been happening. Prior to that, I never had this appear.

[Ben_S]

If it's intermittant, it's probably server problems, overloaded mysql.