Sony Experia M5 Problems

<p>Hi Sony</p> <p>Got the Experia M5 on upgrade 2 weeks now from last week phone shuts down on its own. Phone battery about 40% and just shuts off. Try to switch power on but phone has blank screen. Plug in charger then shows battery level and then only switches on. This seems to be a common problem as I have seen many customer reviews with same issue. Why is Sony not sorting this out. Very disappointed with this.</p>