I have HD writer AE 3.0, bit I had a similar problem that drove me nuts for months.
Mine kept stopping at 72% of the disc image. Every single time. I had previously successfully made 4 dvds from my TM900. The second time, and the third time I tried, it just kept stopping during DVD writing in the same place every time.
After a dreadful period of writing, uninstalling, rewriting, re editing, chopping, changing, and trying everything I could think of and finally realised that the only difference was probably my edits.
I wondered if it was having prblems doing any of my enhancements just at the 'join' of the dvds, ie where the video runs over from one dvd to the next.
I deleted the 'fades, transitions, titles,' and everything else that fell around the 4.7 GB mark. and the 9.4 GB mark (ie where I felt like it may be making the join to the next dvd).
It worked. It stopped freezing, and wrote the next dvds perfectly.
The way I found this out, was that if I put the 3rd Output file into the 2nd output file position, (ie out of chronological order) as it was always making the 2nd dvd that froze. I felt it was something in the 2nd output dvd that was mucking up.
Try it, delete your fades, transitions, etc... from your newly edited movie, and reoutput it. Then try to write that to DVDs and see if it works.