ISP is ATT Uverse with Intel Dual Band Wireless AC 3168 router. Protocol 802.11ac. Frequently, when making more than a brief call with my Moto G5+, the strong WFi connection is dropped in favor of a weak, broken cell tower signal. Sometimes I can get the WiFi reestablished by standing over the router, but the only sure fix is to hang up and call again. (Had the same problem with gen 1 Moto.)
It’s possible you need to do some evaluation of the quality of your Wi-Fi connection, but here’s an easy way to keep your call from switching from Wi-Fi to cellular:
I suggest looking at this:
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