Did you read his AMA?  Or listen to any of his recent podcast appearances?  He talks about why he basically hasn't been able to work for three years because of his house problems.

No I did not because I don't go follow these authors around to appearances, monitor their personal lives or listen to podcasts. I just read a lot of books (and I don't reread — I move on and find new things). Jim's are some of my favorites, especially the Dresden series, and I don't feel like he owes us anything (other than maybe a new progress update on his website), but it's disconcerting to see such a big drop off in production all of a sudden from a guy that has been so reliable.

A year or maybe even two off for a break, sure we can all understand that, but at this point we've slipped well past that between major projects and sure we got a short story collection this summer and occasionally get a new story in comic form, but that's not the same and almost all of those short stories were republished in Brief Cases and there was little new writing included.

At the time of writing, it has now been more than four years since Skin Game was released in 2014. Prior to this, the longest gap between two Dresden novels was only two years between Cold Days and Skin Game. Prior to that, there was a new book every year, from 2000-2012 and there were even two books released in 2001.

What has changed? At this point, it's even been three years since any JB novel has been released at all (Aeronaut's Windlass). Only short stories. Brief Cases was a nice appetizer, but in no way filing. It's not that Jim is now suddenly trying to take on two series at once because he's already done that while managing to still get at least one book out per year from both the Dresden Files and Codex Alera from 2004-2008.

Is it just that Jim has reached a certain amount of success and doesn't feel he needs to generate as much book income any more or what is the deal?

It's pretty alarming to see one of our favorite authors go from such a steadfast and reliable crafter of stories on a regular basis to trending toward the new GRRM track of authoring one, maybe two, core books from his most popular series per decade.

It's also incredibly frustrating to seek updates about the series from the author's personal website and be offered no other details than a now 3-year old update that says Jim is back to writing Peace Talks after finishing the Aeronaut's Windlass and that "It’s still way too early for blurbs, preorders, release dates, and the like." No, the time that was way too early for that stuff was 2015. The time for that stuff was in 2016. It's now 2018. At this point, you're basically two years late on all that preamble stuff and at least a year late on actually delivering the book.