I have numerous Roku devices, and have never had to replace a remote because of lack of functionality. I even have an old 2 XS, which is now more than ten years old, that still functions if I take it out of the drawer. Roku remotes should last for a long time. That's not to say they can't fail, because all electronic devices can fail. Unfortunately, you can only use a voice remote on a Roku Stick, as they do not support using a simple IR remote.
I do want to offer a couple of suggestions. First, I suggest not using the USB port of the TV to power your Stick. I realize it's convenient, but USB ports on TVs don't always provide sufficient power for the Roku, especially the Stick models with the WiFi receiver built into the USB cable. Which reminds me, you are using the USB cable that came with the Roku Stick, correct? Your WiFi (and remote) won't work if you use a generic USB power cable.
My other suggestion is to look closely at the battery case in your remote. Different remotes have different battery orientations, with some having both batteries placed in the same direction and others have them in opposite directions. Make certain your batteries are inserted correctly for that remote. The battery case will indicate the correct orientation.
Dan
Roku Community Streaming Expert
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