MacBook Pro 16 2019 10.15.4 Kernel Panic / Reboot When Plugged In -- Help!

Can confirm that the update of this morning did not solve the issue (at least not for me, even made it worse as in now if 1 external display goes to sleep in clamshell mode the MBP restarts with the usual panic cpu error). Got a callback from Apple asking about the update and whether it fixed the issue (to which I said no obvs), also got confirmation that the engineers are aware of the problem (affects several users) and that they're working on it. Also, they confirmed it is a software issue rather than hardware.

Good to know this is a software issue. I was a bit worried it was hardware and all the Apple stores are still closed in our country due to COVID19 (and probably won't open up for quite some time. My 16" MacBook was pretty flakey before, kernel panics, running hot with fans for no reason, etc. I did a full reformat and reinstall which didn't fix it. Fortunately, the software update (for me) has solved everything and now it's the workhorse I expected (and really need at this time).

I have the 2.3 GHz 8-Core Intel Core i9 (it would be interesting to know if the continued version are only happening on certain configurations).

As always, it's really important to send in reports.

Have you disabled the power nap when plugged in? It works for me on 10.15.4, 10.15.5(19F96) and 10.15.5 (F101). And it even works when I enable it again. But after each update I have to flip it off and on again.

I have been able to perform a bunch of resets looking things up myself and finally got my MacBook to actually turn on again. (in the process, I realized the lady from Apple Support gave me wrong instructions than listed to perform one of the resets she was having me do 😑)

Regardless, I have also downloaded the supplemental update, but can confirm it did not resolve the issue for me as well. Turning on the MacBook with the external monitor would cause a full fan blow-out and cause the laptop to shutdown while logging in.

That's awesome that the update fixed it for you! Unfortunately, I still have a lot of what you've experienced—kernel panics, fans running hot with no intensive use, blue screens, etc. And the new software update they provided did not fix..

But at least they're trying I guess?

This is frustrating - 10.15.5 did nothing to improve the regular kernel panics for my "new" 16 inch MacBook Pro. I've followed the suggestions in this post. I don't understand why it is taking Apple so long to fix. I see that several have stated that Apple is aware. I'm very disappointed.

I am still experiencing the same problems.. I was JUST barely able to log into my MacBook this morning by holding the power button for 10 seconds. The fans would give full blowout and keep shutting down during login with and without being connected to any external display.

My friend with the same model, but with version 10.15.3 is still holding off on updating his as he's aware of the issues.

so disappointed since I'm locked down in a south asian country where theres no Apple support here, anxieties every day hoping it wont completely break down. Until i get back to Japan. Unbelievable its not yet fixed, if its a software issue. im praying on every update they release.

After the second update of the 10.15.5 my computer is fixed. I am back to enoying a solid macbook pro like the older models. After 50+ days i finally enjoying a beast macbook. No wake up panics or the few random freezes i ve had . Im never updating OS again ....

I am having the exact same problem on my MacBook Pro 16 which I've owned for 3 months. The problem started on 10.15.4 but has continued on 10.15.5. Every time I let the machine idol and the screen goes to sleep it crashes and restarts. Apple told me initially that it was a software issue probably caused by one of the apps I had installed so I had to do a complete reset of the computer and reinstall MacOS and only reinstall the apps back on slowly to try to identify which one was causing the problem. 

At first this seemed to work but after a while the problem returned even when I only had the Microsoft Teams app installed. I thought that it couldn't possibly be that that was casing the problem but nevertheless I decided to do another reset and reinstall of MacOS only this time I left the machine completely standard as it comes from factory. It is now running much better however it has kernel panicked once with a completely clean system so it has to be a fundamental problem with Catalina.

The apple support team told me that they are aware of a problem with Catalina and are working on a fix but I'm finding it hard to accept that I've just spent £3000 on this computer and I'm supposed to accept that it isn't going to work properly for several weeks / months! 

I would also like to add that I have noticed in the last few days that battery performance is definitely not as good as it used to be. On a full charge the battery used to last a good 9 hours (I'm only a light user) and now I would say it only lasts about half that time.

Also my machine has just kernel panicked again in-between writing this post so that's now twice that it's happened with a completely clean machine!

Apple you need to sort this ASAP!!!!!!!!

I'm afraid you've got me there. No idea how to do that. I'm not very computer savvy in the first place and this is my first ever MacBook.

Having said that I have 100% noticed a drop in battery performance in the last few days. For example while browsing this forum and sending a few emails this morning it used 10% battery in around 30 minutes!

10% battery would have last me a good hour when I first bought the computer - as I said I'm only a light user.

I got my new 2020 16" Mac today. I have the same issue. I had nothing installed on the Mac except MS office. I just updated to 10.15.5 a few minutes ago. Hopefully this expensive device doesn't continue to crash with kernel panics. Crazy - went out and got the 32GB RAM / 2 TB SSD i9 model with the upgraded video. Ill know more tomorrow, but I thought I would post too so that Apple will acknowledge Houston there is a problem.

I had the exact same error too. I hope you sent it to Apple. Catalina is a nightmare. It’s simply not stable at all and instead of solving these issues they waste resources by developing new features. Shame on Apple MacOS development!!!!

My daily morning ritual is trying to boot up my MacBook for 20 minutes.

I am proud to say today, I broke my personal record and was able to boot up my computer after 40 minutes of crashing and rebooting from the login page 🎉

Looking forward to wasting more of my time trying to get some work done!