Since I created the Dragon Stone over a month ago, I have noticed that the game frequently crashes while I am battling the monster. 

I do the battles by simply clicking repeatedly on the monster. Sometimes it will display the "monster killed" message and show a second monster, and it will crash while I am battling the second monster. Sometimes the crash occurs while I am battling the first monster that is displayed.

It works OK about 80% of the time, I think. Maybe 20% of the time, the game crashes and I have to reload the browser.

If it crashes, it does not remember the damage that was done to the monster during the battle episode that had the crash.

I use Internet Explorer 11 on Windows 7.  I don't reboot my machine very often, not more than once a month or so. I haven't noticed if the behavior changes after I reboot my computer, because it is an intermittent problem and I can't control when I am able to battle the monster.

Can someone please try to reproduce this and add it to the bugs-to-fix list?