Roku TV keeps turning itself off

I am having the same issue. I want the tv to stay on a app/channel for a good 8 hours with out touching the remote. I unchecked all the power saving setting but it still goes to the home screen after a few hours.

UPDATE:

I think I've narrowed down what the problem is, and it is not with my Roku TV. This is what I did:

• I first purchased a new Roku TV: same size, same model, but I encountered the same problem, which logic would exclude the TV being the problem.
• I then unplugged, then replugged-in, my modem. Problem persisted.
• So I called AT&T, and a technician there was very helpful. He said the modem cannot turn a TV off. If it's a modem problem, instead of my TV screen going completely dark, a message would pop up, that there's an Internet problem. He said it probably is a power source problem -- a short in a wall socket.
• I tried 4 wall sockets in the room where the TV is, and with each, the TV still kept turning itself off. A clock radio plugged into one of the wall sockets also blinked off, repeatedly going to 12:00.
• I then plugged my TV into a charged generator and, Presto!, no more turning itself off. I'm calling an electrician today to fix the power problem.

My new TV (unboxed 2 weeks ago) started doing the same thing 2 days ago. I have 2 other ONN Roku tv’s at my primary house (this is our summer home), no issues.

I’ve did all steps got fast was able to reset my tv to manufacture settings after several times of resetting/TV turn off,

but didn’t work last update was yesterday at 11:53 pm then tv started having issues calked Roku they told me sounds like hardware issues to call tcl but only open Monday-Friday and of course warranty is expired..