From Nathan Bransford:
Pandemic-related capacity issues at printing companies are wreaking havoc on publishers’ fall schedules. The crunch has, ironically enough, been exacerbated by a surge in print sales and underinvestment in printing infrastructure in anticipation of increasing adoption of e-books. Reprints for hot-selling books now take a month or more and publishers are pushing back publication dates.
Link to the rest at Nathan Bransford