Same thing is happening to me! My calls on wifi-calling are dropped when the phone automatically switches back to cell preferred. This has been happening since the new update. Going into the wifi calling settings and changing it back to wifi preferred does not hing as it switches back with no warning. I also work from home and my mobile phone is my ONLY phone. I contacted my service provider and they said they had nothing to do with it and could not help solve the problem. They said this was a Samsung Issue.
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