Delay in conversation

I have been having a delay in my conversations on my Xfinity mobile service. It is for about 5 secs. My wife has Xfinity mobile and does not have the issue. It is very frustrating as I have to tell callers I have a 5 sec delay so they do not feel I am interrupting them. Conversations are very difficult. What is the fix??? I did not have this issue with my other providers. I do not want to switch but if cant get fixed I might have to. Again my wife has Xfinity mobile and no problem