Return of Notification feed error . . .

[pburn]

I thought this one was behind us, because I hadn't seen it for some time. Now I've received this error three times since yesterday. It's random--it doesn't show up every time I check my notification feed.

Windows 10, Chrome, desktop version.

[mcdougle4248]

I have received the same error twice today. 

Windows 10, Chrome, desktop version 

[comics-scifi-collectibles]

I've seen it about a dozen times today. 

I'm using Chrome and windows 10

[valueaddedresource]

I've gotten that error today and the bell has not been lighting up consistently when I've been tagged in posts either.  Chrome Windows 10 Desktop

[*lady*madonna*]

Ditto to the message.

Firefox, Windoze 10, desktop version.

[loveyourimagination49]

Same iPhone