if you were to lose your wireless connection internet explorer would NOT crash, it would simply time out and not load w.e webpage you are trying to load and your computer may display a notification saying something like "not connected/disconnected to/from (insert wireless name here)"
if iexplore.exe stops responding then you may have some addon or something causing it to crash. you can try resetting internet explorer back to default settings, open control panel, double click internet options, go to the programs tab and click reset web settings. Then go to the advanced tab and click restore defaults. BEWARE this may remove all your bookmarks (I don't remember if it does or not)
if that doesn't work you may have some sort of infection on your computer. What's your antivirus?