@Baldo-Mero: No I don´t want to watch netflix movies. I do not know if you understand me ... when Hangouts works so why FB Messenger can not work? Both app are text based. I have my choice what I want and you have your own.
I have just realized it also, but first I thought becuase my Nokia 8 mobile has just received an update.
But if you have this issue too, maybe there is something with the FB messenger.
I tried to delete and reinstall both (Garmin Connect and Messenger), but none of them solved the problem.