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Sony pc com fix 80% of bugs
Install sony pc comp
get orginal usb cable connet the phone to laptop or computer click on update if ur on last firmware click on repair and let it install if not update to last firmware and after phone runs connect again then click repair after finish the phone runs with factory default..
Now Overheating problem
Install watchdog lite and see which app cause cpu and actually remove it if its sony app disable it..
Go to setting then more and disable NFC just turn it on when u use it
Now battery problem
Discharge ur battery to 0% now phone well turns off
Put it into charge ( don't turn phone on) wait untill it fully charged then turn on phone do this 2 time every month
I hope i helped and sry for my bad English iam trying to help 🙂
Hi MagdyYassen
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When the phone starts overheating, what application are you using and how long are you using that application before the phone starts to heat up?
facebook and whatsapp working on background and using chrome browser
If you recently updated,the battery and the system will be stabilized after some days.
Keep us updated.
It'll be wise to reinstall lollipop to smooth things out
Bridge (for Mac)
Alternatives on How to backup Xperias
http://talk.sonymobile.com/thread/36355
update yesterday to 726 firmware then connected my phone to pc companion again and i click on repair it's reflashed lollipop update again but this time with factory rest but nothing new battery drain fast and phone overheating if i play asong cpu temperature up to 60 °C And Battery temperature is 37 °C 
which apps are running in the background? were you playing games and/or recording on 4K?