I have a TCL Roku Smart TV 65R625. 2 weeks ago I started to have intermitent sound loss with Netflix. I've tried the following steps:
1/ Removing Netflix and re-installing
2/ Unplugging TV and pressing the remote Power Button for 10 seconds, turning the TV back on 10 minutes later
3/ Turning Wifi off and on
4/ Resetting the TV to factory settings
The problem has persisted. Netflix informs they issue the same binary to all hardware manufacturers and it is the hardware manufacturer and Roku's problem. TCL tells me that it is Netflix and Roku's issue.
Re: TCL Roku Smart TV Netflix Intermittent sound loss
I am having the exact same problem. I just installed the 65r625. I have great picture quality and excellent WiFi strength. 4k content plays without issues in all other apps but but drops intermittently while using the built in Netflix app. I took the same troubleshooting steps that you did. The issue did improve after reloading the app but returned an hour or so later.