Fix ROKU device problems by clearing the cache. This is how to clear Cache in your ROKU device every time you have a glitch with sound, frozen apps, buffering TV, black screen, or whenever your Roku device doesn't work properly:
Press the Home button 5 times
Up button 1 time.
Rewind the button 2 times.
Fast Forward button 2 times
Wait for your device to reboot.
If this doesn't work for you, unplug your TV for 1 minute. Plug it back in and repeat the process.
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