I can't find this exact problem in the forum through search. Wondering if someone can suggest a fix for my export issue. I am using Pinnacle Studio 24 Ultimate

In the last three days my video exports lose the picture part way through, though the sound continues to the end. I do not see any markers on the timeline. The timeline has picture throughout. The point at which video goes to black is different with each attempt to export. I have previously successfully exported a different version, but have not ever been able to export the current version.

I have tried exporting to the internal SSD drive at 1080p and 4k, and also to a new external 2T SSD at both resolutions, without success. 

Can anyone please help?