I have the same exact errors listed on my dashboard under the links and new news area even though my website seems to be working fine. The backend also seems to be working fine the only issue is it's displaying the error messages towards the bottom of the dashboard.
This is how both error messages read. Under the New-news section and links section towards the bottom of the dash.
PHP error message
Warning: mysql_connect() [function.mysql-connect]: User xxxxxxxx_wp already has more than 'max_user_connections' active connections in /home/xxxxxxxx/public_html/wp-includes/wp-db.php on line 1141
Error establishing a database connection
This either means that the username and password information in your wp-config.php file is incorrect or we can't contact the database server at mysql15.000webhost.com. This could mean your host's database server is down.
Are you sure you have the correct username and password?
Are you sure that you have typed the correct hostname?
Are you sure that the database server is running?
I've already tried deleting all the plugins and then reinstalling them one by one.
Other than that all I've really done was read how to's on the subject. I did switch themes, I'm using the responsive theme version 188.8.131.52 so I switched to the 2012 theme with no luck then switched back.
Like i said above my site seems to be working perfectly I'm able to upload plugins via FTP, the front end loads fine and seems to be in order.
This is a link to my site, http://wwww.jrjbroofing.tk
Please any help would be greatly appreciated.