Welcome to the Roku Community!
Thank you for raising your concern which is your Hisense Roku TV goes silent every time you adjust the volume.
No worries! We would be more happy to assist you.
The first thing we need to do is to restart your Hisense Roku TV, here are some steps:
To restart your Roku device, you can either unplug the power cable, wait a moment, and then reconnect it, or you can use the following steps to restart it from the Settings menu.
Let us know how it goes, and we'd be more than happy to continue assisting you further.
All the best
Anjelie
thanks, it worked