Meizu MX4 Pro

After two months, I have the first problem with my MX4 Pro (4.5.7I). Third morning in a row after waking up my phone is locked (I think spontaneus restart, need give pin code for unlock sim card).
During Christmas, my phone lost signal one time in town but sim card was little ejected, again I pushed her, everything is ok but now sim card is ok. I dont know what can i do?

last edited by caponebn