My Ultra Roku remote started with this behavior about a week ago. I have blown out the buttons with canned air, reset the remote, reset the roku connection and re-positioned the Roku. None of these actions fixed the issue. Do you have any other suggestions.
I think they just fail internally sometimes. Mine was fairly new. I'd contact Roku and see if they will replace it. They did for me. I did prove that it was the remote and not the Roku box by swapping with another box's remote. The problem went with the remote, not the box.
I believe the roku controller uses both IR and WiFi to talk to the box - you can verify by using black tape to block the IR on the remote control and/or the box. This should eliminate the double click issue but also prevents the remote from turn on/off power to the TV - so not a solution - just a troubleshoot step.
I contacted Roku support and they sent me a replacement remote which has worked flawlessly.