Unstable sprint signal leading to call drops

I bought sprint Galaxy Note 3 unlocked from ebay India. Everyrhing work great in it but one problem and the biggest problem which can't be cured is UNSTABLE SIGNAL. Signal falls from full to no service and again gain network.

Did everything I can. Updated with latest stock rom, which automativally updates bootloader and modem.

Factory reset, cleaning and all, flashing new rom, changing to New Sim and trying every network Sim available.

There is nothing under the sun I didn't do.

I used this phone for a month without Sim and it worked normally without getting overheated. And I speak and chat on social sites like whatsap, Skype and it's works fine.

What is the real problem? Radio band compatability? Hardware? Antenna compatability?

I don't know what but this is the best phone I have ever used. If I can fix it, I would be the happiest one.

Please help

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