I have "resolved" the problem by purchasing and installing a new WiFi card in my PC. To recap: the Intel wireless adapter in the motherboard was reporting that it was using WiFi 5 (802.11ac) and was...

@David-TP Have you also tried to update the wireless driver of AC3168 to be the following one:...

dictoresno wrote So you have the adapter set to the wireless “a” standard and not “ac”? As part of troubleshooting, I set the 802.11a/b/g Wireless Mode property for the adapter to "5GHz 802.11a"...

I just installed the XE75 Pro (2-pair) in my house, replacing my old Netgear Nighthawk R7000 router, and the Wifi speed on my PC has plummeted from 300 Mbps to around 10 Mbps. The speed on my phone...