Phone drops in middle of Wi-Fi call

Hello,

My iPhone has been dropping calls when I am using Wi-Fi calling. I won’t hear the person talking suddenly, then the call will fail and I notice in the left hand corner of the screen it will now say “Xfinity Mobile” instead of “XM Wi-Fi” as when I started, like it switched suddenly. It happened during a 911 call. I called support and they had me do a network reset which seemed to help but now it is doing it again. Is there anything else I can try?