Recently my Sony Xperia Z device is showing some issues. One of them (to start with) is that the battery is dropping really hard from for example 40 percent to 13 percent. The strange thing is that it also goes up from (for example) 43 percent to 50 percent. These issues started when my phone got really warm from lying in the sun for a short period. It also doesn't charge properly when it is on the charger.
Now the real problem is that yesterday my phone got out of battery and it wont start up anymore. When I try to start up by holding the power button I don't get any response from it. When I put it on the charger it keeps restarting/rebooting on the 'Sony' logo. The device keeps doing this without doing anything else.
I've tried to flash the device with the Sony Update Service, without any luck.
I am really out of ideas and I'm hoping that you guys could help me.