Akash

Hi, I am facing a strange issue with the fives. I have connected then via hdmi arc and they work beautifuly and give awesome sound. The moment I use the other hdmi port for playing games or Chromecast then tv display switches off momentarily and then comes back. This keeps happening till I switch the speakers off. So basically I can't play games and watch Chromecast with speakers on. Does any one know if this is a know issue and is there a work around. Thank you