MacPro late 2013 - OS Catalina - Crashes all the time

Hello Grant! Thank you for the reply.

I went to my Systemreport >Thunderbolt to find out what versions I use.

This is what came up:

• Thunderbolt bus 0: Firmwareversjon 19,2
• Thunderbolt bus 1: Firmwareversjon 19,2 (Here is Thunderbolt display connected with Firmwareversjon: 26,2 Port Micro-firmwareversjon: 2.0.7
• Thunderbolt bus 2: Firmwareversjon 19,2 (Here is G-Raid Studio External Harddrive connected with Firmwareversjon: 24,1

I have found the information.

Maskinvareoversikt:

 Modellnavn: Mac Pro

 Modellidentifikator: MacPro6,1

 Prosessornavn: 8-Core Intel Xeon E5

 Prosessorhastighet: 3 GHz

 Antall prosessorer: 1

 Totalt antall kjerner: 8

 Nivå 2-buffer (per kjerne): 256 kB

 Nivå 3-buffer: 25 MB

 Hyper-Threading-teknologi: Aktivert

 Minne: 64 GB

 Oppstart-ROM-versjon: 134.0.0.0.0

 SMC-versjon (system): 2.20f18

 Illumination-versjon: 1.4a6

Hey Grant!

I had iMac connected using thunderbolt cable to my MacPro for sharing purposes. I think its called Thunderbolt bridge. This cable I have now disconnected physically.

And I have also disabled HandOff feature from my iMac, MacPro and iPhone. I read somewhere that HandOff could cause problems or make OSX unstable.

So far, there has not been any restarts since I have done this, I will be running machine for the next few days without shutting it down and see.

I cant think of anything else since you said the "Criminal" here is the "Thunderbolt drivers, thunderbolt software or thunderbolt hardware", so it might be something with that iMac is in Sleep mode, then MacPro in sleep mode and at some point something happens here that causes the failure on MacPro.

Although, iMac has never had issues with freezing og anything else so its only MacPro.

I cant think it would be a hardware problem because all this started with Catalina upgrade.

Thank you again Grant for taking the time to answer my post and trying to help me, I appreciate it!

If I dont get any restarts in the next few days I will post last reply to close the thread. I really hope that it has something to do with the Thunderbolt cable connecting two Macs for sharing purposes.

Hey Grant!

The machine is now stable I think, I have not had any stabilty issues since I disconnected Thunderbolt bridge connection.

Thanks for the tip about the Gigabit Ethernet sharing, I will acquire a simple switch and try to connect them that way.

To summarize, for other people reading this topic;

The computer resets I belive were caused by the Thunderbolt bridge connection between two macs. It worked fine before Catalina, so I assume it has something to do with that.

Solution for file sharing between Macs as you suggested; Disconnect thunderbolt bridge and go over to Gigabit Ethernet sharing using a simple switch.