I'm on the Android app and this has been happening for a while. When I scroll down a thread every so often a advert for mn podcast appears.
I then can no longer scroll or read further for what seems like eternity! I know it is more likely about 10 seconds or so but this is so annoying, especially when I want to just quickly scroll through and only read the OP's posts.
This may seem like something trivial but often it never disappears and you have to go back to menu page and go back into the thread and start scrolling from the beginning again.
Mumsnet, this is frustrating, please fix!