Once again...Gmail and (lack of) push notifications

The Gmail app on my Verizon S6 (stock Marshmallow) is again lagging in showing push notifications. I've flushed cache, "uninstalled/reinstalled", everything I can think of short of a FDR. Is anyone else experiencing this?

To clarify...there are times when I'll get the push notification of having unread messages. I'll have 2 or 3 messages all of a sudden and then I go look at them, and one message could be from a few hours prior.

If I happen to be in Chrome on a PC, I may have a Gmail...

Once again...Gmail and (lack of) push notifications

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