A thing you could try now is see which premium plugins needs updating. I tested and singled out the plugin that gave me errors that way.
In my case, I used a plugin rollback to keep forcing updates and a wp-core email sender to check what wp was writing about the updates (mostly because I was working in local).
I’ve seen in here that another known plugin thats triggers this is WPML.
Hope this helps since as written in their wiki there isn’t a specific time support can help and they have mentioned that EUM doesn’t necessarily work with premium plugin and themes.
