What happened to the Piled Higher and Deeper comics? Without dating myself too badly, I have enjoyed PhD comics since the beginning. For the past few years, there have been about 2 or 3 new comics a week, but there has not been a new comic in months. I don't really follow all their social media contacts, but it does not look like there has been a tweet or a facebook update in a while.

Was there any announcement about a break (or the end)?
According to the latest comic, the series is on hiatus until November 2019. The unsubtle message behind the comic is that the author doesn't owe an explanation to anyone.