I wanted to update this thread because I finally found the cause of this problem.
“Adobe Crash Processor.exe” - in this case, it was part of Adobe Acrobat.
I have Adobe Crash Processor blocked from internet access. Normally, this is a non-issue, but apparently, it can effectively kill internet access - I don’t know if it does this directly until it can reach its target servers or whether its constant attempts to call home are effectively overloading Comodo so that it can’t process any other network calls.
What I do know is that when I find myself with internet suddenly dead, if I kill the “Adobe Crash Processor.exe” process, my internet is instantly restored.
I just wanted to post this in case others run into the same issue.
And if there’s any chance that it’s overloading Comodo Firewall, then this failure mode should be taken into consideration in future updates.