I posted about this issue recently on the Matrix general chat room. I don't have access to my computer so won't be able to get the exact post
Device: Pixel 7
Country: India
ISP: Airtel
Sim: Physical
Issues started with the March 14 update. I haven't done the April updates yet since I'm traveling, so I'm not sure if April update will fix it for me.
Calls work fine if I'm connected to my mobile network ONLY (and not WiFi). If I'm connected to WiFi and my device stays idle for about an hour(the exact idle duration is somewhere between 30 mins and 2 hours), the calls stop.
I have tried disabling/enabling WiFi Calling, but nothing helped.
Before the March 14 update, my WiFi Calling was set to be enabled.
Someone on Matrix suggested me to install Carrier Services, but that didn't fix it either
I have been using LTE only for the past 10 days and the calls are working fine. But I'd really like to connect to my WiFi when I'm at home without worrying about losing calls.. In the 1st week of the issue, I actually lost calls to a couple of job offers since I didn't know about the issue.
I'm happy to work with someone to help debug this from a user perspective