Anyone else getting dropped calls?

Got a refurbished Nexus 5X for my wife last week, today she was using it for conference calls at work and had multiple dropped calls. We are on t-mobile and she never had an issue with her S4. APN settings look correct and WiFi calling is off. Anyone else having this issue? I read that this was common on the Nexus 5, has it been fixed in this new model?

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