macos catalina keeps restarting my computer

Hey @poil66, I had the same problem not knowing why then it came to my mind I upgraded my RAM to 128Gb and used RAM modules from different companies a absolute no go. So I took out 64Gb now I have left 64GB in my iMac from the same company. Never had a Crash again.

I was having this problem as well. See if turning off the Handoff feature in Sys Prefs -> General -> Down at the bottom fixes the issue. I was having the issue on one mac, erased it clean & installed again and the problem persisted. Then I installed on a completely different mac, different hardware, and the problem persisted so figure it was either application or setting or account related.

Upon further research, I believe I found that the problem was related to my external OWC dock and monitor combination. After taking the OWC dock out of the equation the restarting problem has stopped. If you do a clean shutdown and pram reset, and do not reconnect to your monitor or try a different monitor does the issue persist?

I had the same problem since i upgraded my old Macbook Air 13'', to Catalina at December.

At January i ordered and received my new 16''Macbook Pro and i experienced the same problem. My machine was restarting suddenly during the night or long time of inactivity.

A detail of high importance: The problems appeared as soon as i migrated my old system (settings, files, apps etc) to my new machine. Last week i tried to uninstall an old version of Caffeine application which was coming from my previous machine but (mysteriously) was working at Catalina. The problem has disappeared for a week now. No restarts at all. Hope it helps.

@Joelle75 - got the same issue on my new MacBook 16; first I have gone through the reset of the SMC. No success. Then, I have reinstalled Catalina 10.15.4 , and now apparently no panic messages "restart because of a problem".

I am quite curios on the "with a woof of air", what is exactly, is something related to the reset of the SMC? Thanks

@GreenBadger' reinstalled Catalina, apparently works! No panic messages anymore. I am curios to understand the noise which comes from the ventilators and the end of the SMC, is that normal? Tx for your reply

Updating to 10.15.2 fixed the problem for me.

@illusiondweller

Seems like a RAM issue or a .kext file that causes the Crash. Try starting your Mac in SaveMode and check if its Crashing there if so it's likely to be a hardware issue.

I have, first, (1) reset the SMC, even if it was quite unclear to me the process itself, then, no wait, (2) I have downloaded Catalina from Apple Store, reinstalled the Catalina (download and reinstall right away).

Left the MacBook16i9 on "sleep" (8 hours, the whole night), then, with my surprise (in the morning) no mistakes (i.e. restart due to a problem...panic). Seems it works now.

I hope that I have answered your question.

I started a procedure (complaint) with my local apple store (supplier) because the problem was already there from day 1.

But to have it selected as a DOA device it needs to be within 8 days prior to the invoice date.

At the end the sollution was a -> new motherboard (mainboard) and wait for ok from apple en then waiting to be replaced... or b --> new Mac.

Finally I got the new Mac and for now no problem what so ever.

I just stoped checking the software problems and don't think is has to do with Catalina.

But that is was just a hardware malfunction.

I had similar issue after upgrading to Catalina. Before upgrade my system would constantly freeze with spinning wheel. After upgrade system would continuously reboot. I booted Ubuntu from USB to remove macOS as a variable. Ubuntu immediately warned that hard drive was about to fail. Replaced fusion drive with new SSD in 2012 mac mini and everything resolved.

After months of my iMac restarting itself automatically after shut down, and me needing to either force shut down with start button or restart in safe mode after a very long wait then shut down, the issue appears to be resolved. I installed Catalina update 10.15.6 and can now shut down without any issues.

@Bobo321. Please try: go to system preference/energy saver/...take off the "enable power nap", both situations, please let me know if it works.

I recently purchased a iMac2019 and it will sleep then sometimes need to re-start upon waking and give me a long list of an error. Something about "Sleep transition timed out after 180 seconds while calling power state change callbacks.....etc...""

I contacted apple support and they said to reset SMC (Which I did) then operate in safe mode. If it happens again in the regular mode, then reinstall the macOS for macOS recovery? Should I do that? or is this something that is wrong with Catalina and eventually there will be a fix?

Thanks