A common reason why your Apple TV remote may stop responding is a low or depleted battery. If you have a Siri Remote, plug it into a Lightning or USB-C cable and let it charge for at least 30 minutes.

Apple's revamped 4K Apple TV features an A15 Bionic processor, 64GB or 128GB of storage, and HDR10+ support. It comes with a USB-C Siri Remote.