I'm not sure if this has been mentioned before / is known (I couldn't find a post), but one of the users of my PeerBoard community has problems when trying to write response to a post.
He mentioned that pressing backspace removes the entire message rather than the last letter. Also, when he responds to a post, it typically results in multiple posts, as if his messages sometimes got submitted before he was finished typing. I believe he is on an Android smartphone. I can ask for more details in case this problem is not known to you yet.