The last 2 weeks I always got notifications instantly - real time. I have gone through the forums, troubleshooting, updating, un and re installed, everything that you have listed for others to do & more from my own googling. Still I can not get my notifications in real time. I switched to another app & it is working. I prefer the Gmail app, but I guess I will have to use what works as it is important that emails come in real time. There is obviously an issue on your end from the comments.