Poor quality of sony experia phone

Hi. I'm a very unhappy customer. I got a Sony xperia m5 device in November 2015. After a few weeks of use it began switching off by itself. The only way to turn it back on was to plug it into a charger. This happens even if i had a full battery. I contacted the Sony mobile customer service and they told me to take it to my network provider. So I have taken it in and I have been told that the SONY m5 devices have been recalled. Is there a new batch coming through and how long do we have to wait? This is absolutely not fair, as I am paying for a device which are off no use to me. My concern is that if a new device is issued, will I be having the same problem. What solution has Sony mobile come up with? and what will be the waiting period?