My Roku shuts off automatically after about 5 mins of it being turned on.
I have the Express 4k+ model, and just recently after turning it on, I select my usual streaming app, and after about not even 5 mins it just automatically turns off. I've restarted/resetted the roku, I've switched both the HDMI and power cable. Neither seems to work, it's always the same outcome.
If you are currently powering your Roku device through your TV USB power port, try using the supplied power adapter and plug into a wall outlet.
If using the wall adapter already, try using another power adapter. (Any 5volt, 1amp cell phone charging adapter will work. Same goes for the power cable, a cell phone micro-usb charging cable will work).
Roku Community Streaming Expert Just another Roku user... I am not a Roku employee. Insignia RokuTV, Ultra 4660, Premiere+ 3921, Express 4k+ 3941, Streambar 9102