@Kimberleymayman apossible reason is lack of wifi bandwidth assuming the PC and phone are in the same room and connected by wifi. Video wifincalls do ise more data than a voice call but unless it is a group call it should be under 5Mb/s. Run a simple speedtest on axsite like Fast,com on the PC when the phone is not in use. Poor WiFi coveragecis very common issue.
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65inch Sky Glass, 3 Sky Streaming Pucks, Sky Ultrafast + and Sky SR213(white Wifi Max hub) main Wifi from 3 TP-Link Deco M4 units in access point mode
