u/Dsa464

So I had this Hisense 55R61G tv (smart tv that used Roku) for a while, working perfectly and decided to sell it. The buyer messaged me a day after this video, the restarting problem (where after opening an app, after a few seconds it would auto restart). He returned it back to me, and it is working completely fine at the moment. They still tried software updating, factory resetting, and it still didn't work for them, only difference was that I used the original remote while they were using another remote, still Roku but from Amazon since i forgot give mine. Anyone know why?