Chosen Solution
The Mac mini has been plagued with bluetooth issues for a number of years. With many people suggesting that the thick alloy case being part of the issue.If one was to CNC a large opening at the top of the case, and replace the removed alloy with a perspex cover. Do you think that could improve bluetooth connectivity and its related issues? Or is it just a case of poor quality control when it comes to Apple Bluetooth controllers?
Sometimes Apple makes a mistake, here on iFixit we’ve called them out a few times! This is not one of those cases. The design is sound, the placement of the system and/or what you have around it is your issue. So NO! Altering the case won’t help you here and all you’ll do is make a nice case a pile of junk! So let’s refocus on its placement, do you have a metal desk or shelving which you have the system sitting on? Do you have metal surrounding the system in any way? Here’s the location of the Bluetooth Antenna
As you can see its what you have the system sitting on that needs to be looked at!
