I bought my Lumia 635 in October of 2014. About a week ago (August 16, 2014), I was typing a text when the phone just froze and would not respond to touch. Then I switched it off and switched it back on. When the phone came on, it was frozen-i.e. will not respond to touch, the date and time was altered already (to July 1, 2014, 4:34 pm), it was automatically on flight mode, and it was on the high screen lights. I tried switching on and off, but it remains the same. can't touch, can't assess. I replaced my sim, and the phone performed normally for a few minutes and back it went to the whle senario. At the moment, when i put it on, I need to press it a lot longer than usual to get it to come on. When it comes on, the phone is frozen and exactly as malfuctioning as I described above. The newest is that it then comes on and off on it's own without any prompt.
I have tried the soft reset; there was not a single difference. I cannot try the hard reset because the phone is frozen - not responding to touch. I am disappointed, but I guess this is why it is important to invest in a durable phone. A cheap phone cannot always be trusted. Any advice will be appreciated.