Problem with OSC control with blueprint

I have created simple buttons to control 1 cinematics by OSC message(play/pause/reverse/stop). After I play the simulation, all of them buttons work only for one time. After that, they won’t respond at all. If I stop the simulation and restart the sim, the buttons start working again but still only for once. I have attached screenshots of blueprint. If I’am doing anything wrong, please let me know. I am very new to UE4 Blueprint.