I believe I have located the major source of instability but unfortunately at a sacrifice to performance.

     I have an Nvidia 210 video card in this machine for the console.  It’s a very low end card but adequate for that purpose, however, in 2019, Nvidia discontinued driver support so I had to switch to using the Linux nouveau driver which given the relatively low performance of the card was not a big deal.

     Well recent Linux kernels have a bug in the driver for this card which results in the card DMA’ing into memory that it has not allocated, and when that memory happens to be used by something else, crash.

     But as it happens Nvidia has again decided to support that card however the drivers, now 340.108, are not compatible with newer kernels so I was forced to go back to 5.4.0 which is considerably less efficient than 5.7.