Since yesterday, I have been seeing this error message in my Wordpress logs (I've masked out my server information) :
Lines 1858 and 1860 (bold below) has this set of code :
Any advice as to what's causing this and how to fix this ?
It's not the file you're looking at. That's just the file WP is using to connect and it's failing.
I take it your site is still running, so this is generally caused by your site dropping a connection mid-stream and WP tries to reconnect, due to a slow process. Have you tried the old standard of disabling some plugins? IIRC comet cache had a problem with this a few years back.
Thanks for responding to my question. I decided to open a support case and the support team looked at this quickly and was able to determine that there was an issue with the MySQL service. They have migrated me to a new service.