Does Anyone Else Experience Indexing Issues Lately?

Hi,

I have two blogs in entirely different niches. They are both relatively new sites and we are publishing around 20 articles monthly to each.

In the past 6-9 months, 90% of our articles have been indexed without any issues and things have been going smoothly (traffic growing steadily, ranking for hundreds of keywords, etc.). We internally link all articles well and manually submit them to GSC right after publishing.

However, since the middle of September, almost none of the articles (on BOTH websites, which is weird) have been put in 'Discovered - currently not indexed' category.

What is your experience in the past few weeks? Is Google having some issues or should I take some action?