What happened? Worked great on my Kyocera Hydro Vibe with outdated Android. Now with my Moto G3 the app shuts down over and over  reading emails  loading  sending  but mostly switching between email accounts. Really sucka because I've been using K9 for quite some time and it is the best email app there is. Well it WAS until I updated phones. Sad that K9 mail isn't able to handle the upgrade.
February 15 2016