I started seeing repeated K-9 restarts when I upgraded my Tab S2 to K-9 v17. Simple emails display fine, but more complex ones (possibly the number of links) cause the restarts. Often I can read the same emails after the restart, only to hit another restart shortly after. I am not seeing this issue on my Pixel 7a.
I believe I managed to capture a debug log but have not had a chance to review it. I downgraded to v16.1 and the problem disappeared.