Unlocked smg900p Data keeps dropping

Hello all this is my first post so i applogive if im posting this in the wrong section or breaking any other forum rules. But on to what my problem is I just today unlocked my Samsung galaxy s5 smg900p it connects to my new carrier just fine bars are ok ocassionally dropped to none but usually stay around 4 or 5 but data connectivity sucks i can stay connected maybe at most 15 20 mins but it always drops idk what to do i tried switching to dif mode global lte and gsm same outcome in each mode so if anyone could help me with this problem it would be greatly appreciated.thanks in advance:)

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