There aren't any crashes listed in 'View all problem reports'. I used the term "crash" loosely. If a component (in this case I'm assuming StartAllBack's DLL) suddenly and unexpectedly stops working/has an unhandled exception/whatever, which in turn causes Explorer to be restarted, I call that a "crash". I care little how this is logged and categorized in the Event Viewer. I care that it was unexpected and unwanted, and caused me to lose my opened folders, which is an inconvenience for me, as I tend to have multiple folders open at all times.
Perhaps I should have also mentioned the message in the Winlogon event: "The shell stopped unexpectedly and explorer.exe was restarted.".
Explorer does not close by itself (and thus needing to be automatically restarted) on any of my other computers with Windows 10, and it didn't do that on my Windows 11 computers prior a specific version of StartAllBack. Thus, my conclusion is that the issue was/is caused by StartAllBack. I cannot be certain since it would seem that this problem occurs at specific intervals, and cannot be triggered manually. That would mean that I would need to possibly wait for another occurrence, then uninstall StartAllBack, and wait to see if the issue would persist.