*POSSIBLE SOLUTION*
I had the same problem where it turned off recording, yet it saved and everything was fine, it just stopped recording. That day I didn't restart my computer before the recording, and since then I returned to restarting within the half hour before the recording time and it hasn't done it since.
I can't remember the term it's called, but I DON'T record the way where you listen to it live with the wave line moving.
Restart right before recording and see if that helps. So far it's worked perfect for me.
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