Is there something wrong with my Xperia Z?

I got this phone 3 months ago as a birthday present.Previously I'm using an iPhone 5s and i didn't experience any problem ( except loading screen on Clash of Clans). The phone is a beauty and the UI is a butter.

But after a week it started to reboot itself.so i thought maybe there's nothing to worry about. And then the phone started to lag but not a serious lag it's just when i tried to scroll the webpage it sometimes started to get hiccups.

And the phone always getting too hot at the top back of the phone around the camera area which sometimes i have to cool my hands down. When it's charging, it would get even more hotter.

Sometimes the phone took so long to charge. When i left the phone to charge at 43% and when i came back 3 hours later it just charged to 70%.

I love my phone and i don't want to compare with my iPhone but i really need help.Is there something wrong with this phone?

We're sorry to hear you're experiencing such issues with your Xperia Z. Please backup your data and perform a software repair using the instructions linked below.
http://talk.sonymobile.com/thread/54636

For further assistance, or if the issue persists, please contact your local Sony Mobile support team. Our numbers are listed on the next link.
http://www.sonymobile.com/...tact-info/

I apologize for any inconveniences.

- Andrés

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