Just some 4 weeks ago all the incomming notifications regarding the next match or the message that I receive from my FA mates have suddenly disappeared. The do come to my phone in wifi mode but with huge delay - e.g. some requests from my friends to visit their match come 2-3 hours after the've been posted. When the phone is in 4G mode no messages or notifications come at all. No changes have been made to the game itself or to the application settings. In the phone menus everything is ON.

Please, advice what else to check?

Thank you in advance