IE7 crashes sometimes

IE7 crashes sometimes


Hi there,
i try to debug my JavaScript for IE7 at the moment and it works quite
well with the debugger. But now i have to face a very awkward problem:
I found a case where the debugger does not start, no. IE7 simply
crashes.
Worst of all, it does not happen everytime. It is some drag&drop an it
crashes while the draggable is drawn over the droppable field - seems
if it happens more often when I drag&draw *fast*.
Any idea if there are any logs or something where I can look up what
happens? And what is even more confusing: why causes some JavaScript
the whole browser to crash?
Hope you can help
Eric