My wife blog got strange behaviour, in comment section no comment at all even she claim that she has around 4000 rows in column.
I inspect the tables in database using phpmyadmin to see this :
wp_comments table status show ‘in use‘ . This state made those behaviour in her blog.
To solve this problem :
1. Select table by put thick near the name
2. Choose action ‘repair table’ and execute it.
When it’s done you’ll see this page :
Just ignore that message, it means everything get back to normal 