Premiere Pro Export Issue: Video Content Getting Cut Off Midway!

When I export videos using Premiere Pro, 9 times out of 10, the export completes, but the video content only includes about half or two-thirds of the full duration. The export seems to finish, but the video gets cut off prematurely. This happens far too often. Does anyone know how to fix this?

-I always select "Export Entire Sequence."
-I use preview files.
-I have plenty of storage space available.