Ah I get what you mean now, I just force closed LastPass myself and yes, when I reopened LastPass app it needed me to re-enable AutoFill, as if it was the first time I was using LastPass. But you do have a misunderstanding, the app was just asking you to re-enable AutoFill only, not re-configure everything(I believe fingerprint authentication should still work, for example). The reason is the AutoFill feature relies on LastPass running an Accessibility Service in the background, and so when you force-stop the app, the Accessibity Service is also stopped, which prevents LastPass from doing AutoFill again. Hence it shows dialogs to teach you to re-enable AutoFill as it doesn't know you have already been taught. To solve this do not force close LastPass at all!! It is not a malware or battery-draining application, you need to just let it be and let it run whenever it likes. I know that sounds bad and scary, as you might think apps are not supposed to run in the background all the time, that' drain your battery, but here's another misconception you have. On Android many apps run in the background like 99/100% of the time, such as your SMS app. But you don't see your SMS app ever appearing on your top battery-draining apps list under Battery, because good apps can keep running in the background, but not do anything until they are supposed to. Battery drain happen when bad apps run in the background and keep doing useless work, causing your CPU to keep running and drain battery. As for why it doesn't stick after a reboot, have you given LastPass the permission to run on boot under Privacy Guard? This is because the Accessbility Service, like many other Android Services, are killed after a reboot, so the app needs to run automatically when your device boots so that the service can be restarted, and let AutoFill work again. I have been using LastPass on my device for very long now, and it has worked properly for me, AutoFill and all. Perhaps you wanna check your Privacy Guard settings? And also any apps like Greenify that might force stop your LastPass app(it doesn't need to be Greenified! Don't worry). Hope this helps
Edit: Oh yes, about the forgetting your user credentials part also. When I force stopped LastPass it also logged me out(I was only saved by the 5min grace period that I set in the settings). So just don't force stop LastPass, and it'll be back to normal
Thanks for looking into this. I guess I might need to do a clean install because the fingerprint authentication and autofill settings don't stick when I reboot without forcing closing the app. This appears to be different behavior than what you have experienced in your post.
I'm not running greenify and I made sure to set LastPass not to be battery optimized in the battery settings.
Thanks again for your help