3 problems with Mac Mini M1

Cash out and play different machine.

If it does the same thing, then you can bet it has something to do with your specific environment.

Keep in mind that the Mac Mini’s wireless antenna in built into the bottom cover and things like poorly shielded display and external drive cables, can cause interfere with both Wi-Fi and Bluetooth.

see > https://support.apple.com/en-us/HT201542

Also you did not mention what monitors you have or how they are connected to the Mac Mini. (include monitor brands, models, adapters, cables, etc…)

I have a 16 GB M1 Mac mini driving three monitors in a flight simulator.

My set up is as follows: X-Plane 11.55.2 on a 16 GB M1 Mac Mini connected

1. To a Dell model 2007 FPS monitor (1600 x 1200 @ 60 Hz via VGA on monitor to VGA/DVI-I adapter to Startech.com USB 3.0 Dual Head Graphics Adapter to USB-C on Mac Mini), and
2. to a Westinghouse TV model LDD2240 (1920 x 1080 @ 60 Hz via HDMI to HDMU), and
3. to a Flatron W2252TQ (VGA ơn monitor to Belkin VGA/Thunderbolt adapter to Thunderbolt on Mac Mini)

DisplayLink driver from Startech.com was loaded and activated. OS is Big Sur 11.4.  Logitech Saitek Yoke, Power Quadrant, Rudder Pedals, and Radio Stack.  Flight Velocity Pro Trim Wheel.  Mini iPad with ForeFlight is mounted on the yoke and provides GPS position on a map (VFR, IFR, or Satellite).  Another mini iPad with Air Manager V.3.7 from Sim Innovations shows the instrument panel, and allows one to have only external views on the three monitors. I often switch to that view AFTER completing pre-takeoff checklists and getting underway.

Thanks for the monitor info.

Again, thin poorly shielded external drive and display cables can affect both WI-Fi and Bluetooth. Try re-routing all of your cables opposite of your Router and Bluetooth devices to see if that helps. You might also try placing the Mac Mini on it's side with the bottom facing in the direction of Router and/or Bluetooth speaker system to see if that improves the wireless connections.

I would try using a USB-C to DisplayPort cable for the second monitor instead of USB-C to HDMI.

You have 14 days to return it no questions asked. After that, you will have to jump thru hoops to get a replacement.

As a long time fellow Mac user, I'm sorry to hear that you are going thru all of this hassle.

If you opted for a replacement, I would be interested in hearing if it solves all of your for-mentioned issues.

Nice to meet another long time Mac user. My first was a Macintosh 128K, next was a Performa 6300 CD with printer, then a couple of G3's. My first risky purchase, was a newly released Early 2006 Intel Core Duo and it lasted for years. After that I started collecting Mac Mini's. Currently I have a 2010 and a 2011 upgraded to SSDs that I use as media servers. I also have two 2012 Mac Mini's, one for the wife and one for grandkids, both have SSDs and plenty of RAM. I'm currently using a 2018 Mac Mini 6-Core w/32GB RAM as my main machine. After thinking long and hard, I opted for a space gray 2018 last year instead of the M1, mostly because I run dual displays and use lot of USB devices.

I have written an article with full description of the flight simulator mentioned above ( with an M1 Mac mini driving 3 monitors). You can find it in on pages 50-53 of the August/September issue of ‘Midwest Flyer’. I have tried to put the link on this and other threads, but they keep getting deleted. The title of the article is “Fighting Lockdown with a FlightSimulator’.

There may/may not have been a hyphen in the word lock-down in the title.

I have had a Mac Mini M1 16/512 11.5.2 since Dec 20. I went thru all the initial bluetooth issues which were corrected months later with software updates. I find the Wifi to be very good, fast enough and consistent. I have not tested my wifi throughput so it may be going up and down but the feeling is that all is good at all times. In March 21 I added a Netgear Orbi Wifi 6 mesh router with an additional Orbi satellite to replace my 5 yo Fritzbox 7390 wifi routers which were flaky at times and slower (my family constantly nagging me about poor performance) so my wifi at home has improved overall for everyone in the house. My Mac Mini connects to the Netgear wifi network using the fastest Wifi 6 802.11ax protocol.

Now that they have just about sorted out bluetooth connectivity to a high level of usability I now find the bluetooth range to be quite short, I can not move the mouse or keyboard too far away (over 3ft/1M) without experiencing partial or full dropout. I can't lean back in my chair with the keyboard in my lap and expect it to work.

I have experienced some random reboots whilst I was using it, maybe 3 times in the last 2 months. Occasionally when I bring the Mac out of sleep by touching the mouse or kb my Samsung 4K monitor might display an entire screen of bluish & white pixels for 3-4 seconds before displaying the login screen but it is no real problem, just alarming, does not happen often.

Overall, I am still really happy with this Mac Mini, it handles whatever I throw at it including multiple browsers with 30-40 tabs open, 4K security camera feeds all the usual apps like mail, antivirus/antispam, etc. I can flip between any of these apps with no lag and with consistently good wifi/internet. All this in a low power package that makes no noise and is as cheap as chips :)

If you are using the same HDMI cable as before, then you should try a different Premium Certified HDMI cable..

If you are using the same Apple USB-C adapter to HDMI adapter as before then you should exchange or replace it.

Then if that doesn't fix the problem, you should get and try a USB-C to DisplayPort cable with that ASUS Display like I mentioned earlier.