iMac keeps crashing after Catalina upgrade

I’m having this issue as well. I have an external monitor (HDMI) and a LaCie 2big Thunderbolt external drive attached.

Once I disconnected the Thunderbolt drive, the restarts stopped happening.

So for me, it seems like a Thunderbolt issue.

I have the same problem. I'm using MacBook Air 2016. After I successfully installed macOS Catalina yesterday, I restarted my Mac but found the Mac stuck on the loading bar and won't turn on. I have entered into Recovery Mode and checked the startup disk with Disk Utility's First Aid. However, no error found during the process. Then I follow this tutorial to downgrade from Catalina to Mojave: https://iboysoft.com/mac-data-recovery/downgrade-from-macos-catalina.html, everything works well. I guess it is possible that my Mac is not compatible with macOS 10.15.

Hi, thanks for your reply. Oh sorry, I typed the version wrongly, my computer is 13 inch MacBook Air 2017, haha.... Yes, I have read the official macOS Catalina compatibility. Technically, my computer is compatible with macOS Catalina. I have no idea why my Mac won't boot after update Catalina, but after I downgraded to Mojave, everything works OK.

I can't agree more that as a new operating system, there may be some bugs. Hope Apple can fix them ASAP.

I have a Macbook pro 13'' early 2015 and the upgrade is a total disaster. After facing the issue of stacking in the screen "setting up" your mac for some hours, I reboot using the button on my MacBook. And then what a surprise: Catalina auto restarts every 3'. Just to mention that using the MacBook without an external Monitor i am facing the same issue. Bluetooth connection also unstable since it looks like the Magic mouse is connected but it is not....

Second day in my business and I can't work....

POSSIBLE SHORT-TERM SOLUTION:

I have turned off automatic graphics switching while I am plugged in to my two external thunderbolt 3 4K monitors. I have not a had a crash for nearly an hour, where I was getting a crash usually within ten to fifteen minutes of startup.

Debasser, not quite a short-term solution. I have already turned off automatic switching of the graphics cards. I too thought it helped solved it then the issue kicked in every time I stepped away and allowed the computer to sleep on it's own.

I can confirm, when I manually locking the computer allowing it to sleep from there by making the request in the Apple Logo (or by pressing control+cmd+q), I am able to wake my computer just fine after 1 or 2 hours.

The issue comes up, with my monitors connected, when I allow my computer to sleep on it's own, then about 15-20 minutes later it crashes and restarts on the wake.

Come on Apple! I'm about ready to put on a skirt and become your next NFL cheerleader on this fix. Being a man, I'm sure this view will be encouraging for you to quickly find a solution.

This upgrade crashed my iPad Pro, I had to make an appointment with apple to fix my ipad , and still it changed everything ,,, very ****** off ,,,,, what the **** is apple doing ? I hope there is a lawsuit

I have the same issue with a late 2017 iMac, crashes on each shutdown.

Programs are running generally OK, sometimes some lags, music cut out, etc, but I put that down to the new OS bedding in.

I've only shut down three times since the upgrade but it has crashed each time.

Have the the same issue. Using an brand new 2019 iMac w/ i9

intel chip and an external Vega 56 eGPU in a Apple-approved eGPU enclosure. Installed Catalina last night and it will freeze and restart whenever certain apps are attempted.

*Feels* like it’s happening when it tries to use the external eGPU, but that’s just a gut feeling.

This is about Mac OS 10.15 Catalina not your iPad is running iOS this thread is not about iOS, You should post in the correct threads it would at least help anybody looking for your specific problem...

Apple just released 10.15.1 beta to register developers, I will update when I get a moment in my day and test it to see if this resolves anything.

if anybody has a developer account and is inclined to install the beta, report back as well

farisfromcalgary wrote:

This is about Mac OS 10.15 Catalina not your iPad is running iOS this thread is not about iOS, You should post in the correct threads it would at least help anybody looking for your specific problem...

lol this thread is already way off track. Everybody is just reporting random crashes they're experiencing.

Same here. Apps are crashing constantly, and the system will crash as well. I reinstalled Catalina, booted into Recovery and ran Disk First Aid, and even installed on an external drive and migrated the system over to it, and I still see the same behavior.

Safari crashes (usually) after I open it and start to type into the search/location bar.

Notes closes once I start typing.

Even Spotlight search (CMD-space) disappears as soon as I start typing into it.

I tried to run Disk First Aid on the internal drive (when booted from external). It showed a disk error that it presumably fixed, then completed successfully. Tried to run it again, and got the same error, with some additional ones. Then tried a third time and the whole system went black and restarted.

Would have restored the previous OS from a backup, but my backups haven't been mounting since the upgrade. :-/

One thing that may be related to other users reports that it could be video card driver related; when in Boot Camp, Windows Update tried to update the video card driver. It said there was an update, then said everything was updated, then said there was an update when I checked again, endlessly.

iMac Retina 5K, 27inch (2017), 3.4Ghz i5 with 32 GB RAM.