Q: Mac Pro Reboot Into Pawer Save Mode

It may help if you use WWW.Etresoft.com/Etrecheck software - download, run the diagnostic and post the listing.

The software was written by a regular poster on this site and will give a better idea of what is going on on your system.

One thought that comes to mind - Yosemite and above will compress applications in memory before swapping out to VM - if the application is called it is had to be uncompressed before use --- and you may have an application where on compression the data becomes an executable instruction. 

anyhow the Etrecheck report is a great way to show what your system is doing before it crashes.

That does look like a RAM error. The only suspicious extension you have is that sound driver. You could try removing it for a while and see if anything changes.

check the logs from about the same time as the panic, looking for "error" or "parity"

check the About this Mac report for modules that are accumulating errors or have dropped out.

Are you running time machine or any other software that automatically does something on an hourly basis?

If you have time machine - automated hourly backup may be the cause.

As your error is hourly - if a portion of the software running hourly is compressed - it has to be uncompressed to run - at that point in time - there is an extremely slim chance it may be corrupted - but if the slim chance happens to you it can be very frustrating.

I did an internet search for "TLB invalidation IPI timeout"

There are other discussions with this same error message and I noticed that the posters panic report lists a lot of USB devices - and you have a lot of USB devices.

One discussion on apple is that seems to go on and on and points to problems with USB drives Thunderbolt Pegasus R4 Experience?