I'm wondering if it's just a me issue but as I'm scrolling feeds and it doesn't matter if it's local or all, new or hot, or any combination after a bit the feed just stops and I can't go any further.
Sometimes I run into this as well. Usually I cam scroll up a few posts, and start scrolling down again and it works. I think it's just taking the instance a little longer to respond than it takes you to scroll and hit the end of what you have.
I'll give that a try next time it happens. Of course I'm like "oh that makes total sense" once I hear it. It's probably the same reason for the other problems I'm running into.