I have a sharp as well and it kept doing it over and over wouldn't let me do anything but turn off and on... so really quick before it switched to Netflix, from the home screen I went to settings> system> system restart... so far so good
I'm pretty sure Netflix and HULU are paying ROKU to switch to their channels occasionally. This keeps happening to me randomly when pressing any of the buttons on my ROKU Ultra remote. Doesn't matter what I'm watching. I've had it happen pressing OK, any of the rocker buttons, pause/play, rewind, and forward buttons.
I had the same issue just popup on my new Hisense Roku TV. I'm watching live television and it keeps taking me back to the Netflix login screen. What's weird is the sound is still from the live TV, and the profile icons are showing what is on live TV.
Has nothing to do with the remote. It's a software glitch.
I fixed it by opening Netflix, scrolling to 'Exit Netflix' to close out of it, and went back to watching live TV. It's been 60 minutes and it hasn't popped back up yet.
We're sorry to hear about your experience. And we appreciate you sharing with us the steps you take to seems to resolve the issue. In case the issue occurs, kindly keep us posted and we're glad to follow up.
Should you have any other concerns, feel free to let us know.