Definitely not the AppBase as it's not there yet (however you might want to test it on https://steemitstage.com/)
From what I saw in your post, it was most likely issues somewhere around frontend/browser/network connectivity.
If you experience bugs in frontend, here's a proper GitHub repo to file them: https://github.com/steemit/condenser.
There's a lot of development going on for both fronend and backend so I would expect that over time we will see less and less annoying UI/UX quirks related to various errors.