I have been using the Roku Voice Remote Pro for about 6 months with no issues, Starting in Late December 22 or early Jan 23, the remote started lose its paring to control the TV functions like power, volume up/down and mute, but the remote control functions that control the STB functions like channel change and back button continue to work. My Roku is used with a Samsung 65 inch SmartTV. Did Roku perform an upgrade that broke the TV control functions? I can repair teh remote the reoye and it will work for a few minutes then the TV pairing will again be lost.
There have been a number of similar posts. The TV control commands are sent via infrared (IR). The remote's IR sending on some Voice remotes has started to fail intermittently. This can be confirmed by pointing the remote at a digital camera, one in a cell phone will do, and observing the camera screen while pushing the tv control buttons (power, volume, mute) on the remote. If IR is being sent you should see flashes on the camera screen.
See if the solution in this post helps. (https://community.roku.com/t5/Remotes/Roku-Voice-Remote-TV-Controls-Stop-Working-Potential-Fix/m-p/8...)