I have the Roku Ultra. I have had it since shortly after the Ultra was introduced. Lately, it has become very sluggish in it's response to the remote. A reboot fixes this, but it is annoying to have to do it at least daily, sometimes several times a day. Not infrequently, it will spontaneously reboot while I am watching something. It has become an increasingly unstable device for me (I have the latest updates). Anybody else having problems with the Ultra?
Can't say it's been a problem with mine. I might go weeks without a reboot. The only time it's rebooted is a firmware update or loss of commercial power. That hasn't happened in a long time. . In fairness, it isn't used heavily, but it can sit there untouched for a week and works just fine when I do use it.
Dan Roku Stick (3600), Ultra (4640), Ultra (4670), 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.
Do you have an MicroSD card inserted into your Roku? I have had the odd issues where my Roku got buggy due to the MicroSD card getting corrupted. And a weird issue i have noticed with my Roku making the Remote sluggish is, for some reason if my Android box is not turned on while i use my Roku i can't use the remote. I either have to turn on my box or unplug the power source from it for my Roku remote to work properly.(Freaking Weird issue)