I have had a wide range of issues across different routers with the VOIP Xfinity line and wifi calls. In fact calling from my VOIP line calls would mute for about 10 seconds exactly after 15 minutes IF the other caller was on a wifi call. I validated this over a dozen times. That problem is very similar. I just got off a call with another Xfinity user and at first we both had our cell phones using WiFi calls and it was the same symptoms but no specific time limit. I could not hear them for about 10 seconds then would pick up with them in mid sentence. These are nothing new unfortunately and having similar issues with VOIP landline with Xfinity. And I'm highly technical with a master's in IT and to me this has nothing to do with the phones being used. Everything to do with how the data is routed. They need to put a team on this because having spend 2 decades supporting IT the people that actually post like this is a small fraction of who are experiencing it especially because the symptoms are so random and it isn't clear to users they are even on a wifi call.
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