@joeleelynn I have had issues with ads disappearing in the past and have managed to bring them back by quitting and changing between wifi and mobile data - but this could be coincidence.
As @frenioz00 says @Bruce_Bubello is right. I have hit the jackpot 5 or 6 times and each of those I had hit the stop button as soon as it appeared, but there's no guarantee as I've been playing for over 300 days sometimes with an extra spin from ads.
Back on topic - I'm totally hooked and like a madman trying to win every challenge I see and find out everything there is to know about the game... I need help!