Hi, I do not know if I am the only one having this problem, the phone started to crash over and over again, suddenly it started to open different apps, and go back to home screen and started to lag. I could not even answer a phone call or open whatsapp, it just started to act by itself, making phone calls to different contacts. Besides, it is overheating, I do not know if the battery is overheating or what?. And about two weeks ago it just went black. I have had it for 11 months. Is it normal?

that is not normal... contact your seller for a repair/exchange.