I bought the Xiaomi mi box S. After turning it on, it works for about an hour or a little more, but then it turns off. At the same time, the Internet works, the video plays back normally.
If the set-top box works for a while and then turns off, then the problem may be in a heavy load on the memory. You can reset the settings of the set-top box to the factory settings or clear space on the set-top box by transferring this to another drive. Similarly, the cooling of the TV set-top box does not cope with its tasks. Therefore, overheating occurs and the set-top box turns off. The first thing to do is to clean the inside of the TV box. To be 100% sure, I advise you to buy a small cooler and install it next to the console.