I really like my Roku tv but the strange sounds on it - human sounds - really give pause and it indicates hacking, a security breach and even possibly a danger to me and others. I need to have this problem solved. Either Roku communities or Roku help - I hope they do, or I am calling police. I don't feel there is any other reasonable choice. Do you?
When you say human sounds, is the TV talking to you about actions you are taking with the remote? If so, that's something called the Voice Guide. Hit the * button four times quickly to turn it off, or you can completely disable it in the Settings/Accessibility menu.
Dan Ultra (4640), Ultra (4670), Ultra (4800), Premiere (3920), Insignia 720p Roku TV, Sharp 4K Roku TV, Nvidia Shield, Windows 10 Pro x64 running Serviio and Plex on a wired Gigabit network.