Every time the burn process is almost complete, a text box appears to say the burn process has been aborted due to an internal error. This happens everytime!
Update your burn routines from the Magix support website. Maybe update your burner's firmware. There's some more stuff on burn troubleshooting here in the user community, which you can probably find via the search function. Plus, you could always contact Magix technical support for some more detailed help.