Just bought a Sharp 55" Roku Smart TV today. Model # LC-55LBU711C. As soon as I booted it up, it start to reboot itself over and over again. Sometimes it would be a few mins, usually about 10 secs. After several attempts was able to setup, and update firmware, still didn't solve the issue. Contact manufactuer, when through basic trouble shootings, checking cords, power cycles, factory reset. Nothing worked. They advised me to return to Best Buy and exchange. Did that, same issue with other TV. Tried multiple recepticles throughout house, same issue. Here is the the weird part... Through a lot of trial and error we discovered that the TV works perfectly fine when on the floor. As soon as is on the stand or a table or any height above recepticle, it starts to reboot. Does this make any sense?? Any ideas?
We would recommend contacting your TV's manufacturer directly to report this issue and request additional support. Each Roku TV manufacturer provides direct support for their products running the Roku OS.