How is that even mathematically possible? Feel sorry for your friend - my laptop had probably not survived...
Had two GOLD+5 yesterday, one of them even retriggered for 5 extra spins. Both paid around 50x. Not really satisfying either, if it's any kind of consolation.
Actually I've never had a great GOLD+5, so I've come to the conclusion, that Bonanza bonuses are best, if you only get the 12 initial spins. At least that's the case for me!