facebook messenger notifications are also a bit hit and miss. they will work for a bit then just stop. I tried clearing messenger app data and that sorted it out but then they stopped working a few hours later. I get a notification if the messenger app is open and i'm in a different conversation but outside of the app I get nothing. I'd rather not have to clear app data every time I get this problem as I have to set the app up again.
Any help would be appreciated.