This is the first thing I try because, believe it or not, it solves a surprising number of weird Roku problems. A system restart fully reboots the device without deleting apps, sign-ins, or settings. It's also different from just turning the device or TV off with a remote, because Roku has a quick-start mode that keeps parts of the system running in the background.

If you don't see a Power menu, go to Settings > System > System restart instead.

If a streaming app or my Roku is completely frozen and unusable, I skip the settings menu and just unplug my device or TV from power. This shuts it down completely and forces the Roku to go into what's called a full power cycle.

When apps take too long to respond, or everything just feels a half-second behind, I'll clear any built-up cache.