Can't add more subdomain sites

Hi,
I have been working with Multisite for this new website I am working on (BlogApuestas.com) and it’s been awesome so far, I have some subdomain sites as:
http://apuestas.blogapuestas.com
http://demo.blogapuestas.com
http://santaco.blogapuestas.com
http://lamejorapuesta.blogapuestas.com
And 8 more without any problem and working really well.

But today I added a new site and there was appearing this “I can’t stablish connection with the database” or similar, you know what message I mean. Then I thought there was any problem during the site creation and I deleted the site and started the process again, and got the same problem.
Then I checked the database and there was any table from this new site, I mean the WP system creates the site but not the database.

Does anyone knows what’s happening?

Thanks!