My Gmail app won't stay open

Gmail is a great service when Gmail won't open then you miss the open your important emails and messages in your email account. You will find instant solutions to open your important emails, so try this things: -

1. Reload the Gmail app

2. Change your device and re-open your Gmail app

3. Clear your Gmail app data

4. Check your internet connection

Check here detailed guide - https://emailscrunch.weebly.com/blog/how-do-i-fix-gmail-on-my-android