Hi
My first instinct is that you've reached your server / AUT threashold and it is now stuck...
Do the following:
- Monitor your AUT for memory and CPU
- overlay your Vusers graph with these monitoring graphs to find a correlation point
- Try with less Vusers or for an hour (instead of 3) and see if the problems recreate at this configuration. If they do not, Increase the number of Vusers / Run duration and see where is the bottle neck.
Good Luck,
Lior