Iglulik spontaneously rebooted again tonight, this time on 5.7.7 it made it four days between spontaneous boots but this time I discovered what triggered it so I’ve got a bug report files with bugzilla.kernel.org and I’m going to give 5.8pre4 a try if it proves semi-stable on my workstation.  I normally avoid pre-release kernels but 5.7 has been buggy and so far 5.8pre3 has been totally stable on my workstation.