Unfortunately, I've been having a great deal of issues with the Gmail app recently. Notifications do not come through, even though they're turned on both within the app and the device. Also, once entering a specific inbox category, the back button closes the entire app, both using the on screen back button and the device back button. I have been holding off posting a negative review for over 6 months now but this is just ridiculous, I'm missing important emails due to the applications issues.