For what it's worth, I've seen the problem with Gmail randomly for a while (months), but I haven't been able to reproduce it reliably. Sometimes it happens after a browser restart, others after I get my mac out of sleep, and I realize it only when I click on a label (the inbox, or the currently viewed label would look normal, no sign of being offline).
Bug 1629090 Comment 11 Edit History
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For what it's worth, I've seen the problem with Gmail randomly for a while (months), but I haven't been able to reproduce it reliably. Sometimes it happens after a browser restart, others after I get my mac out of sleep, and I realize it only when I click on a label (the inbox, or the currently viewed label would look normal, no sign of being offline). EDIT: I've found my own message on Slack where I was asking if others were seeing this issue, it's from end of October. I confess I haven't seen it for a while, but it happened again in the last couple of days.