Hi. I have a lot of problems with my Xiaomi Redmi 1s Model: HM 1SW (armani). After turning it on, it works good for some time (let’s say for half an hour) and suddenly the camera refuses taking pictures, the sound goes off and you cannot make calls or receive them. It appears as if you have enabled the airplane mode, but when you check it, you find that it’s disabled. You have to enable and disable it to try to make calls.