I can't interpret that log but I had a similar issue with my G4 DP 450. After replacing the internal backup battery, the problem went away, never to return. I don't know if a weak battery affects Mac Pros this way (my Mac Pro has not given me any problems) but it might be worth a try. In addition, you could reset SMC.
Jon
macOS 11.7.10, iMac Retina 5K 27-inch, late 2014, 3.5 GHz Intel Core i5, 1 TB fusion drive, 16 GB RAM, Epson SureColor P600, Photoshop CC, Lightroom CC, MS Office 365
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