Remote won’t pair with Samsung tv

I can’t get the volume or power off buttons to work on my xr15 remote. I’ve tried following the setup multiple times. None of the codes work. I tried resetting remote. That didn’t work either. I’ve had this problem since I got my tv a couple years ago. The odd thing is it started working a couple weeks ago for the first time. Then this past weekend it stopped working again. I tried setting it up again but nothing seems to work