The tablet suddenly began to print characters on the screen by itself, as if someone had "bewitched" it. I took it and took it to this service, where the master found the problem in half an hour. It turned out that the sensor is buggy, and its complete replacement is needed. I was pleased that the check was free, and I did not have to overpay for the diagnosis. They had the spare part in stock, and by evening the tablet was ready. I was satisfied with the price, but they gave me a guarantee right away. Now everything is working as it should again.