ace_cap The several novels you talk about are just like 10-20 books over 300 translated books. Overall, there is a rise in release rates. There will always be some books that will have trouble maintaining a speed due to variety of problems (real life issues, etc). And if a book returns to normal, there will be bound to be another book that will have problems later, and that's what keeps your attention that MANY books are having problems, when it's just a handful for a period of time. Once the issue is fixed, things go back to normal, but that is often conveniently forgotten.
Years, ago it was 3 chapters a week, and 2 years ago, it was closer to 10/week, now it's almost 14/week for the longer male chapter books, and about 21 for female books. Together with the nearly weekly mass releases, that raises some books to 17 (longer) chapters/week.