is anyone else with a note 8 dropping calls when sending a text?

Background, I have an UNLOCKED Note 8 (Brought From Samsungs Website), with AT&T. I have gotten a new Sim Card, updated the IMEI Number, EVEN SENT THE PHONE TO SAMSUNG for repair. Phone still drops calls when sending out a text message. I've noticed my phone drops LTE as soon as I place a phone call and it goes to H. I'm working all over DC over nights and it happens both inside and outside of the city. Any Help is appreciated.

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