I believe the remote supplied with the Express+ sends its signals to the Roku by infrared (IR), which is direct line of sight only.
- Be sure the front face of your Express is facing your viewing location.
- Make sure there is nothing blocking the direct line between you and the Roku.
- Check for interference with the IR signal -- some fluorescent lights may interfere, as can direct sunlight.
- You can check if the IR signals are being sent in the first place by pointing your remote at a digital camera, even one build into a phone or tablet, and pressing some remote buttons. If the remote is sending signals you should see them flash on the camera view screen.
Otherwise warranty claim instructions: https://support.roku.com/article/208757058
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Streaming Stick 4K+ 3821 | Streaming Stick+ 3810 | TCL Roku TV 43S245/C107X
