I have had this happen to me a few different times and a couple different ways.

One time i was playing a betsoft slot Great 88 and i hit the bonus that gives you three wheel spins well my computer died right when the boxes reveled what type of bonus it would be, when i got it all back up and running i had a $5000+ win off a $1.25 bet

The other times is more complicated but if you private message me I would like to share experiences with one another