possible clue on multisite issues

I use Cleantalk on all of my client sites, and it works great. But sometimes on multisites, it just can’t seem to hold the connection. We get a lot of errors where it doesn’t synchronize. Today I was in the network admin area and clicked to go to the settings area – where it always says to go to the primary site’s settings. When I clicked that link to the primary site, I got an error.

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Error establishing a database connection

If your site does not display, please contact the owner of this network. If you are the owner of this network please check that your host’s database server is running properly and all tables are error free.

Could not find site http://www.mysite.com. Searched for table _40X_blogs in database mydatabase_WP40X. Is that right?

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Is that maybe a clue? Just sharing in case it is.