Basic troubleshooting stepssuch as restarting the mac, toggling wifi off and on, or even testing alternative connections like an iphone hotspot or ethernetdo not appear to. When you have a poor wireless signal or seem to have an erratic connection in your home, your best bet for resolving the issue may be toggling your firmware version. The only speed they have in common with the 10 gb/s ethernet port on the mac mini is 1 gb/s. I assume that the sfp+ port that you were using was not configured as a stacking port.
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