When something happen once in a lifetime then it can be a coincidence but if that happened 4th-5th times then there is something. You have not told the casino name yet. Have you tried to take a screenshot or a video casting since it happened with you several times. Having something visual will help you to convince others as well as it can serve as a proof.
This time the casino was at Stake but this "issue" happened to another casino. One of these 5 times was in a fiat-only online casino. IMO was a providers' issue, not of the casino.
You are right about taking some screenshots to prove it but I'm not a bug hunter neither I take pics of my winning, when and if occur. Plus, how can I screenshot a crash and a reload almost instantly of the game?
I don't think it is a bug, it says that he won after 10-15 spins. So there is no defined timeframe where he got such high multiplier. He was just lucky to play up until he got that winnings. What if he stopped after 5 spins, and move to another game. He won't see such multiplier.
What would your reaction be if after the crash, no matter how many times you spin, you won't get anything? You would think that you are being screwed by the machine.
I believe the same as you. But as BitcoinGirl.Club said, one (or even two) times can be a coincidence. More than that and in different places,
smells a bit. But maybe it's only me and my "theories"...