losing sound from sonos arc with LG C2 oled

Hi, I have Sonos arc connected to LG C2 Oled Via EARC connection . Sometimes am loosing sound when I open some App like Youtube/ Hot star etc or when I toggle between Apps I loose sound sometimes . But when I open a Netflix App this gets  connected again and sound starts to appears don’t know why . I am using this technique for last few months if I loose sound I connect to Netflix and it is back and move to other Apps. How do I correct this issue .