C]anyone else's comment replies (and notifications) disappearing?

I know the notifications system has always been wildly bugged. But I noticed a serious decline in the last few days; wanted to see if it's widespread.

Many replies to bounty comments are disappearing. Someone told me after reply #4, afaict even more. And I can still see them in the notifications, but not access them.

And now my notifications for rplies are vanishing. It's eerie, like some unspeakable Lovecraftian creature is chewing on my notifications list. I'm going through the list and replying one by one, and each one disappears as soon as I click to reply.

Anyone else?