samhawcroft I am having the same type of error with a site I'm working on.
My error shows up like this:
00000/0): in /homepages/40/d253519779/htdocs/whc/wp-includes/wp-db.php on line 1811
Warning: Packets out of order. Expected 1 received 57. Packet size=3289859 in /homepages/40/d253519779/htdocs/whc/wp-includes/wp-db.php on line 1811
Warning: mysqli_query(): MySQL server has gone away in /homepages/40/d253519779/htdocs/whc/wp-includes/wp-db.php on line 1811
Warning: mysqli_query(): Error reading result set's header in /homepages/40/d253519779/htdocs/whc/wp-includes/wp-db.php on line 1811
On this page there are 3 images and text. Nothing crazy going on.
I'm wondering if this is an error that we on the WordPress side can fix, or do I need to get in touch with the webhost and have them look at the database?