rapid ring app no notification sound

has anyone else having issues using the rapid ring app ,i downloaded rapid ring app yesterday having missed hundreds of rings and motions due to the app been to slow to open before the person has left ,anyway it does now loads all ok and i recive a push notification but my phone only vibrates and i dont recieve any notification sounds like when i use the other app ,my phone is a samsung s10 ,does anyone else use the s10 have the same issue