Gmail Notifications on my Galaxy Note10 I've used Galaxy Note 10 for about 6 months and one of the major issues that I have experienced was related to my gmail notification. I’d go several hours without receiving any emails and just think to check the app and as soon as I open the app then I’d have like 20 emails just sitting there that I had never received a push notification. Do you know any easy fix for this?
Navigate to Settings > Device Care > Battery > App power management > Apps that won't be put to sleep.  Add Gmail to this list to prevent it from being put to sleep for battery optimization. You could also disable this feature entirely by disabling "Put unused apps to sleep."