I am a mobile Hearthstone user.
For the past few months, the chat message that appears in the upper left sometimes shows up and sometimes doesn’t.
Although I always hear the sound indicating a new chat message, reinstalling the app hasn’t resolved the issue.
Additionally, when I enjoy Duo Battlegrounds with a friend, sometimes if both of us press the invite button at the same time, the room does not get created properly and the invite button becomes disabled. Reconnecting fixes the issue, but this has been a long-standing bug. Please look into this as well.