4th Gen 2020 M1 Mac mini bluetooth issues with Magic Mouse2

Apparently someone has used an ASUS one as well. I think it was this one but you can check back in the discussion.

ASUS (USB-BT400) Bluetooth 4.0 USB Adapter

Have you tried factory reset of Bluetooth module - it works for me Use alternative menu found by option + shift + Bluetooth

Mac OS11.2 also downloaded on my Mac mini and (touch wood) I have no BT drop outs in last 48 hours!

No hub, no lag. Powered hub, no lag. Any non-powered hub, lag. And hampers brings up an interesting point: monitors with built-in hubs. Indeed.

I had the same stutter with the mouse, which turned out to be the USB C hub I was using (Satechi Mac mini Hub) once I disconnected this the mouse stutter stopped but I still get the odd connect/disconnect during the day.

I use Apple Magic Mouse, Keyboard and AirPods at the same time.

disconnecting Wifi and just working with Ethernet was the workaround for me.

Many people have problems with the Logitech Devices. I saw this: https://www.heise.de/ct/artikel/Logitech-keyboards-and-mice-vulnerable-to-extensive-cyber-attacks-4464533.html and thought: hm, maybe Logitech bluetooth combined with the T2 Security Chip, because some of them saying, with the logitech bluetooth dongle connected to USB all problems are gone.

The last 3 Mac minis all had this issue, it seems to come from bad shielding around the old USB interface.

One solution is to use a USB-C Hub.

Another is to put peripherals using the old USB plugs as far away from the mini as possible.

I just put my external drive on the floor, and now my Magic Mouse works (better)!

Sorry to say, but this only worked temporary :-(

I had a similar problem when I connected my Apple Magic Mouse. The audio connection to my Amazon Echo (which I was using as a bluetooth speaker) started skipping and breaking up. I know that communication parameters are assigned to a device on connection so I figured that when I connected the Apple Mouse, it auto-configured with a frequency that interfered with the Echo.

How to change it?? Hmmm. Suppose I removed the Echo from my bluetooth devices and then reconnected it when the Apple mouse was connected and enabled. That would reestablish the connection parameters and the MacOS logic should configure it correctly in a way that would not interfere with any connected devices. I tried it and it worked first time.

I suspect this is a general solution to the bluetooth problem discussed here. For brevity, the solution is:

1. Determine what devices are interfering by disabling them one at a time until the problem disappears.
2. When you have found which devices are interfering through fault isolation in step 1, remove one or both of them and then reestablish the connection. E.g., put them back on your bluetooth device list which requires that you rediscover them.

If this is a general solution (which it should be) your bluetooth problems should disappear. Let me know. Thanks!

Not sure where you live re consumer law but the 14 days is for a user choice return - not for a faulty unit. This is clearly not fit for purpose and there should be no issue with returning it as such..

I did (in the UK)

Addendum to my post (https://discussions.apple.com/thread/252078550?answerId=254319439022#254319439022):

The above set-up works also after a restart but was only persistent after an overnight shutdown after I disabled FileVault (unfortunately).

Also a few considerations regarding the choice of a dongle:

• Many dongles available on the market do not work with MacOS. So be careful what you buy
• Asus USB-BT400 is listed as Mac compatible on amazon.de but not on amazon.com. I took the chance and it works for me.
• Logitech Unifying dongle will work with compatible devices (up to 6) but not clear to me whether I could use my Apple devices and B&W PS5 headset
• Hideez also sell Mac compatible dongle but I ruled this one out after reading about poor build quality

See the post on the preceding page by @rafb he does not have a new dongle. Additionally, the post above using an external bluetooth dongle appears to solve the issue. While it could be firmware it suspiciously points to hardware.

That's crazy. I didn't even notice it but I just tried it and can confirm exact same behavior.

iPhone sitting about 5-10 inches away from my Mac Mini on the desk.

As soon as I unlock it, the Magic Mouse 2 is lagging like crazy. Never even had this kind of lag before.

When I lock the iPhone the lag goes away immediately.

I tried turning off handoff and then unlocking the iPhone - no lag whatsoever!

I then re-enabled handoff and the lag isn't here. Super strange.

After reading the latest updates to this issue thread, I noted that many M1 owners experienced the bluetooth disconnect/reconnect problem when they unlocked/woke their iPhone. I have been experiencing this problem for about 2 weeks now and did not know the problem trigger. I unlocked/woke my iPhone 11, which sits about 3 feet from my M1 Mac Mini, and the bluetooth connection immediately disconnected. The bluetooth reconnected about 5-7 seconds after it disconnected. I have sent this information on to Apple engineers via the Feedback Assistant that comes with MacOS developer and public betas.

sok777 wrote:

A restart did the trick for me too.

I might need to try aeroplane mode if it's back. (or when...)

When I turned it all off, I noticed that I was running on LTE. I even turned WiFi off on the Mac Mini but to no avail.

So essentially I was experiencing these issues with only bluetooth enabled on the Mac Mini (no WiFi) and WiFi, Handoff and Bluetooth off on the iPhone.

OK... Good to know.

So I have found something else... Whilst an unlock of my iPhone is not currently trigger it on-demand as it did before, I have found that clicking up in the Menu Bar on the Big Sur Notification Centre icons (I have BT, Audio and WiFi in the main menu too) and pretty much every time I select the audio icon to show the list of audio sources.... all bluetooth devices disconnect.

Putting my iPhone in aeroplane mode and repeating the test shows that it was still an issue. Turning my iPhone off and it was still an issue.

I captured some of the console.log output whilst testing / triggering this and am looking through it now. Lots of logging that relate to AirPlay that is expected and I would guess would be expected when you select audio menu bar option as it scans for the known AirPlay devices... might be related.

If you start to experience BT stutters or disconnects again, let me know if clicking on any of these in the menu bar also cause the issue to trigger for you - particularly Audio.... and let me know if you have any AirPlay target devices on your network e.g. ATV, HomePod etc.

Having been living with the problem since receiving my M1 MacBook Pro, when a disconnection occurs I’ve recently been disabling bluetooth in the control centre on my iPhone, which immediately restores the connection to the Magic Mouse. Here the iPhone bluetooth appears to be the main culprit, the iPad doesn’t seem to have the same impact when bluetooth is enabled, although I’m continuing to monitor this.