NFC works sometimes and keeps showing read error messages

I have just bought a brand new Sony Xperia Z3 Dual (D6633), but I am having a little boring problem. When I pair my smartband or any other equipment trough NFC it just works after some attempts and keeps showing read error messages every time. It seems to me that is a software issue as it works sometimes. How should I proceed?

Unfortunattely it didn't work, as our credit cards in Brasil don't have NFC technology.
I will try to reset my phone to factory defaults as soon as Lollipop is launched so I reinstall my apps just one time.
If I fix with the firmware update I´ll let you know. If this issue persist I will take to Sony Support Service in my city.
Thanks a lot for your concern.

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