Oh wow I thought this was just me yesterday! Some rooms I COULD type in and some I could dnot.
I would type, and then it would send but nothing would show. I would refresh the page and my message/s were never there.
I know the models had not ninja silenced me so it wasn't this BUT I thought it was my internet because all day yesterday my router would disconnect for 1 minute, then reconnect for a minute, then disconnect, reconnect, etc
SO I put it down to my internet being weird.
Happy to read others had the same issue.
I have not experienced it so far today.