Hello CajunSpice, since the issue happens after it works fine for a couple of videos, then it is likely the issue to be related to drivers. would this issue happen when you record your screen, capture from a webcam or external device? You may want to check if there are any driver updates you can apply, or that are being applied to the computer before the issue starts to happen.
Also, in order to get proper support for this issue, it would be better for you to contact the NCH Software support team.