There has been Wifi and BT issues on Mac Minis since the first Intel Mac Mini was released. The first Intel Mac Mini was the only Apple device that I have ever returned in the 30 years of using Apple devices, all due to the BT problems.
As for why, I suspect that it has to due with the short antennas, and the aluminum cases. They are not the only Macs with aluminum cases, but they are the smallest one, where everything is cramped into a small space.
I wonder if one with a Mac Mini Wifi issue would physically turn the back side of the MM towards the router, maybe this would help. It shouldn't have to be done, but it might be worth a try.
Another solution would be to use external Wifi and BT adapters. This would save the OP a lot of headaches and money.
Have you tried external Wifi and BT adapters? So the cheapest way would be to get a Mini and use these adapters?
I think I have returned 4 Minis and cancelled a few more orders because of various issues. I could spend more but it looks like all Silicon Mac have the issue of not remembering display settings when the displays are of the same model and bought at about the same time. Some also reported that even the Mac Studio and MacBook Pro have bluetooth issues.
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