Let me ask now that you are using Asus tablet, I can use 1 time the device runs well, normal application, but suddenly today I use, surfing the internet, the screen suddenly darkens from 4 sides, After that, I started to reboot to show up the logo many times, I turned it on and off again, I used it again normally, I had 2 times already, I also tried running Safe Mode and found on the network is still operating system normal. So let me ask if your device has any problems and how to fix it? Thank you.