iPhone X says it has service, but nothing loads requiring restart

I've had my iPhoneX for about 2 weeks now. I have this issue twice already now, where my phone will say it is connected to 4G all bars, rather than LTE, even though I can normally get LTE in these areas. When this happens I cannot get my phone to connect to anything/load anything. I can't send texts, get on the internet, or load apps requiring internet connection. Even after moving and being in different areas I still cannot get my phone to load anything. As soon as I restart it will work again and switch to LTE. Is this a bug other people are having? Could it be related to AT&T rather than my phone? It is just really frustrating that I have a brand new phone and it is requiring restarts for errors already.