Yea i’ve been having this exact issue a lot. i think something happens in the collection library. do you ever manually add/delete content to the collections? I bundle a series into a collection if it doesnt’ properly group. It’s either that or when i delete/rename a collection its not updating properly in the DB and become corrupt.
U can let the whole thing rebuild and it will work but im not sure what causes this erroneous consistent repeatable error. You’ll probably end up in the same boat i was good for awhile then it started doing it again after several chunk of content over time.
There is a thread indicating the developer team may be aware of it
So maybe a fix sometime down the line.
