Sometime ago i posted a fix but missed some vital information in the title so have decided to repost.
I originally posted the fix asSlow Wi-Fi connection on Mac Mini - Solved!
However this fix will also solve an intermittent Wi-Fi connection!
This is my first post here @ Apple Support. I may be considered a newb to some Apple veterans as I am relatively new to the Apple World of things but I come heavily backed with tech-savviness
I made a discovery whilst troubleshooting the slow Internet connection I have over my Wi-Fi. This simple configuration will help Mac users with the problem I have been facing for a few months now.
Please note - This will only work if you for some reason have the Open Bluetooth Setup Assistant at startup if no keyboard is detected box ticked and/or Open Bluetooth Setup Assistant at startup if no mouse or trackpad is detected box ticked whilst not having the device connected to your Mac.
For example if you connect your iPhone to your Mac in order to enable it to be used as a mouse and/or keyboard like I sometimes do the Bluetooth Setup Assistant will remain enabled which will result in very slow Internet over Wi-Fi speeds which is due to conflict between your onboard Bluetooth device and your onboard Wi-Fi device.
Just untick the Bluetooth Setup Assistant for the device that is not in use then restart your Mac.
I have not yet tried this fix on other Mac's however it is highly probable that this fix is not limited to a Mac Mini.