Wifi Calling unstable on Xfi gateway?

Hello,

I switched from a motorola modem that i owned to an Xfinity Xfi plan with the xfi gateway. Surprisingly the modem has been really great with speed and coverage for both 5ghz and 2.4ghz in my house. BUT one thing I have noticed was that when I have Wifi Calling enabled on my android phone it will work for a little while and then if someone tries to call me it will go straight to voicemail. Sometimes if I am on a wifi call it will also drop said call. Lastly, there are also times I have to call out 2 or 3 times before it will actually connect.

I am working from home currently in my basement and for whatever reason cellular just isn't what it should be. Before with my old modem I could rely on Wifi calling but now i'm stuck and I don't know whether i'll get a call using regular cell service OR if i'll get a call being on wifi calling.

I had a galaxy s10 that had these issues. I then switched to a Samsung Galaxy s20 in January and I am getting the same sort of behavior. Cell network is tmobile.

Does anyone know of anything I can try withint the modem to troubleshoot? Never knowing if people are calling me is not good when I have to work all day.