Here's the info on my system:

Model Name: Mac Pro (Early 2009)
Model Identifier: MacPro5,1
Processor Name: Quad-Core Intel Xeon
Processor Speed: 2.66 GHz
Number of Processors: 2
Total Number of Cores: 8
L2 Cache (per Core): 256 KB
L3 Cache (per Processor): 8 MB
Hyper-Threading Technology: Enabled
Memory: 12 GB
Boot ROM Version: 144.0.0.0.0
SMC Version (system): 1.39f5
SMC Version (processor tray): 1.39f5
Model Identifier: MacPro5,1
Processor Name: Quad-Core Intel Xeon
Processor Speed: 2.66 GHz
Number of Processors: 2
Total Number of Cores: 8
L2 Cache (per Core): 256 KB
L3 Cache (per Processor): 8 MB
Hyper-Threading Technology: Enabled
Memory: 12 GB
Boot ROM Version: 144.0.0.0.0
SMC Version (system): 1.39f5
SMC Version (processor tray): 1.39f5

I have tried moving BIAB to different hard drives in the system, with no change to the stumbles.
I have run system monitor while playing back and do not see any process that arises during stumbles.
I have tried running BIAB from the "backup" hard drive with no change to stumbles.
I have disabled the internet on this machine with no change to stumbles.

I am running BIAB for Mac 2022 (605)

I use this machine rather extensively for music production, including running Digital Performer 10 with no problems.

Any help would be appreciated.

Bruce

Any help would be appreciated.