Due to the same problem when exporting the projects in PS23, I was working for 2 weeks with the staff of the Corel support area and they did not find the solution, but after researching the problem I came to the conclusion that the software has a problem handling a memory buffer when exporting, so if a Split Clip is done every 1.5 minutes at most in the audio track, then the export is done without problems. At the beginning I split clip every 2.5 minutes and the problem was solved, but later in a more complex project it failed again, so to make sure I split the audio track every 1.5 minutes maximum. All this waiting for Corel to solve the problem. But at least you can continue working and export.