The freeze is random, I don't have a certain way to trigger it 100% of the time. There are areas where it seems to do it more so, but then sometimes right in the middle of the open I freeze. Sometimes I can play Df2 all day without one freeze. Others I freeze 3-4 times in the same map.
You can see me freeze in DF1 here. I was just going outside of the building and froze. Right at 19:11 the game is frozen.
https://youtu.be/P2uchvw-h2M?t=1148
In DF2, the same sort of thing happens in the same type of areas. Identical. The game freezes, and nothing works. I have to close the game via the task manager unless I use the unfreeze.
If I can get some time I will see if I can record it in Df2 as well. We still have to do the TeamViewer.