Android-keep getting logged out of app

I am not sure what causes this, but I will periodically get signed out of the app and I won't know when I have been signed out until another device receives a notification that I don't. My device is a OnePlus 7t Pro McLaren edition. The app is up to date and so is my OS. I think it may sign me out quicker if I dismiss notifications or leave them so long they disappear. It will take between half a day to a few days to sign out. Just really annoying really