More clues while searching for a solution...I reinstalled my iMac to the factory settings, and upgraded it to High Sierra as well. Then I installed only a few programs that I need to use for work, to help check and see if this issue was caused by something I had installed. This time, I installed only Adobe CC, Google Chrome, Dropbox, and a Canon printer driver.... ...recorded that evening, and it still did the stupid "stop recording somewhere randomly" thing, multiple times. I thought I was in the clear after an earlier session with no issues, but then I lost probably a chunk of 30 minutes of recording narrations. Grr. Sooo, it looks like the culprit is either one of those programs, or the internet signal itself. Next time I record I'll try turning off the wifi and seeing if it's affected by that.
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