When you have WiFi on. Ok, do you also have a wired LAN connection, as to connect to your LAN but not via WiFi? This as to see if the issue is the WiFi, the WifI port on your MAC, or your LAN. Not an absolute test, but... Also, perhaps go to a coffee shop, or some wears with free WiFi, and test. Looking to see if their is a hardware, or LAN issue.
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