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Message: <blockquote data-quote="iggibar" data-source="post: 1895876" data-attributes="member: 97843">Lots of things need to be looked at, mostly because it seems lots of things changed all at once.You switched from wired to wireless, which is a first major change that needs to be looked at.You didn't state your router spec. Most likely, your router has reached a bandwidth threshold or your router has automatically put the Mini in a low priority state compared to everything else that is already up and running. Having your Mini in a low priority state while you have other devices running will give you fluctuating speeds.If your original 3 Macs were wired, why can't you test the Mini on a wired connection? That would be very helpful in diagnosing in the mind of an IT pro.To diagnose and help eliminate the problem, try this:Get rid of those network adapters. Enter your router settings and click through the required settings options that allows you to change priorities for your devices.(If there's an auto prioritization feature, turn it off and manually assign priorities to each device). Make sure to put your Mini in first priority for the sake of this diagnosis.Follow this order- turn off all network connected devices, turn off router, turn off modem(if it's not a combo unit with router), then turn on modem, turn on router. Wait until router has fully completed it's boot sequence and the internet connection light is on. Then turn on your Mac Mini M1 along with a few other devices(you don't need them all on). It is important to turn on a few other devices so that the memory of the router can hold the initial setup correctly and not have to alter bandwidth spacing a lot afterwards. This is the correct IT sequence when making a change to network bandwidth prioritization.  Come back and let us know how it goes.</blockquote>

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