I use the app for identifying fairly regularly, and sporadically it will close unexpectedly. If it’s going to happen, it usually happens several times over 1 - 2 hours, but it doesn’t happen every time (that wld be too easy). It doesn’t present any notice or warning or dialog box, it just vanishes. It will still be in the carousel of open apps, and if I tap it, it comes up as a blank screen that never paints. I have to close and relaunch fir it to work.
When it happens, I’m in Explore, I remove Location so it’s global, then go into filters and deselect Research Grade so it’s just Needs ID, and select either a date range, or more recently (since there are so many obs now) a single day. Then I start scrolling through, periodically opening an obs, and very occasionally posting a comment or ID suggestion. I do use the app for checking for IDs on my obs, looking up specific taxa for ID, geographic distribution and taxonomic hierarchy, and I don’t think it has ever happened any time except in Explore.
I use the app on Android version 9, One UI Version 1.0, security patch Jan 1, 2019.
I’m sure I’ve left out a lot of info, so just let me know. And btw, I love the app :-)