I have a Roku streaming stick, started using it two weeks ago. Was working great, and then all of a sudden - the display is horrible, only showing low resolution in every app (Hulu, Sling, Live TV, Netflix, etc). Colors are off, everything is blurry, etc -- just your regular low resolution screen.
I've tried a factory reset -- still the same.
Everything is up to date w/ updates. And my wireless connection is strong (says it's excellent) and route is very close to tv.