I have a samsung smart tv on which my roku was working great for almost a year and suddenly just the power, volume & mute buttons don't work. All other are fine. I've reset, changed batteries, moved to a different hdmi port. Nothing.
Try reprogramming the remote for the tv:
settings> remote & devices> remote> remote in use> program tv> follow prompts
Tried that. Went through all the tv codes but won't connect. Doesn't make sense worked before with no issues.