When you try to delete a recording, do you hit the Options (or whatever those 3 stacked lines are called) first, hit stop, then try to delete? I was having that issue, until I figured out how to stop the playback first
Where is the Hamburger lines on a Fire TV Stick DA app? If you mean on the remote themselves. They do nothing at all when you are in the Watch/Delete screen. Any other screen and they go to the Home Screen of DA.
On mine, if I'm watching a recording and I hit the 3 lines button, top right side, a sidebar opens on the right that gives me the option to stop. Once stopped, I can delete