I have an android Samsung S4 phone.
As far as I can remember Facebook Messenger app has always had this annoyance: when I connect my cellphone to the internet the app synchronizes and downloads all the past messages as a conversation history.
The problem is that every old message is downloaded and notifications are continuous since those messages are new for my cellphone. It's a continuous ringing sound since old messages are treated as new, the small chat icon is also constantly present on the screen per each contact I contacted before my cellphone's update.
I would like the app either to synchronize silently or not to synchronize at all since it seems to ignore the synchronize/don't synchronize button I have in the top bar.
I need to use facebook messenger to communicate with some friends who just use facebook but this problem is terribly annoying me.