Phone randomly loses cellular service

My mom and I switched to xfinity a few years ago and for the past few months she’s been experiencing issues where she’ll occasionally lose all cell service for no apparent reason. She’ll drop to 0 bars, sometimes even in the middle of phone calls, and be completely disconnected. Sometimes it reconnects after a minute, sometimes she has to reset her phone, and sometimes it just lasts for hours with no changes. She works from home with telemedicine so this is a HUUUUUUUUGE issue for her.

Things we’ve done:

- contacted xfinity support multiple times, no help. No one knew what the issue was and no solutions they offered helped

- gone to the xfinity store multiple times, no help

- upgraded her phone. She’s gone from a Samsung S8 to a Samsung A52 to a Motorola 5g and all of them have the same issue

- replaced the SIM card. She’s replaced the SIM card multiple times for each phone and got a new one for each new phone, and all of them have this issue

- upgraded our router. We used to have this gray box but now we have the white Xfy or whatever it’s called and the issue still happens

- replaced the router. After the issue happened again with the new router, we brought it in to the xfinity store and got a new one and the issue still happens

- moved the router. Originally both she and the router were on the ground floor but she had the issue. Then we moved the router upstairs and still got the issue. Now she’s also upstairs with the router in her office a few feet from her desk and still has this issue

- turned on wifi calling. Wifi usually works but calls still get cut off randomly when talking to patients

- upgraded to unlimited data. I also changed the setting to use data to enhance wifi when the service was slow in case this could help wifi calling (and not charge us so much) but nope, still get the issue

- checked for service outages in the area. Sometimes there have been outages for other services, but sometimes there aren’t any outages and even when there are, my phone works perfectly fine but not hers

Can we get any help with this? Anyone else experiencing this issue? Any chance of a refund????? We’ve done all of the generic support steps and NOTHING WORKS!!!! What’s going on????