Hi @Oranguman,
Greetings from the Roku Community!
We're glad to assist you with your volume adjustment issue on your Roku Streambar. Please try to power cycle your Roku streambar by unplugging it from the power outlet and plugging it back in again. The purpose of a power cycle is to reset the device's internal circuits, dismiss temporary glitches, and allow the system to start afresh. You can also try to restart your system by going to Settings > System > Power > System restart (if you do not see a Power submenu, skip to the next step) and try to restart your modem and router to refresh the connectivity of the network. After doing so, please see to it that your system is up-to-date.
Let us know if it works, and we'll be glad to assist you further.
Kind regards,
Eunice
Eunice L.
Roku Community Moderator