Here I have some more information.
The export proceeds as follow:
The menu will be export successfully.
The main movie will be rendered to the end (preview). The progress shows 50%.
Then the main movie m2ts file increases more and more.
Normally the short movie should take 800MB, but the m2ts file grows up to 4-5GB.
Ater long time (houres and days) I brake the export.
Export to file takes 40 min.