My ROKU remote worked fine for quite a while but now randomly it stops! I literally have to take out "both" batteries, taking out one does not work, and re-pair it to the device. They have nearly full power each time yet continually stop working. Many times I hit play, set the remote down, watch the entire movie or episode and when I grab the remote it won't work. This happens 8-9 times a week. Why? The remotes are expensive and I just can't afford another one. Is there a warranty or replacement clause somewhere?
Roku warranty is for one year, and the Roku 4 has been out far longer than that (first released Oct 2015). New remotes really aren't that expensive. The voice remote, which most closely matches your original remote, is $20, and the IR remote (no voice, no headphone jack, line of sight with the Roku player required) is $15. There are generic IR remotes available from a large number of locations that can be found closer to $10.
Dan Roku Stick (3600), Ultra (4640), Ultra (4670), Ultra (4800), Premiere (3920), Insignia 720p Roku TV, Sharp 4K Roku TV, Nvidia Shield, Windows 10 Pro x64 running Serviio and Plex on a wired Gigabit network.