I had the same issue the other day, was playing 30p and it waxed through £293 (almost 1000x stake) with one bonus to show for it. I know games can go cold and not hit a bonus for 1000’s of spins (thought think bonus frequency is around 170 spins on this, or used to be before they ‘Remastered’ it) but it was the way the base played that really shocked me, gave one 5 OAK Premium Symbol win in all those spins (normally gives them quite frequently) and 2 Wild Desires, which is terrible. I was playing the 96.8% version as well, so expected better. At least you’re hitting bonuses, even though they’re shit.
I’d previously stayed away from the high volatility games as I like to get some playtime, but the low-medium volatility favourites have been playing like Extreme Volatility lately so thought screw it and started playing Mental, I was pleasantly surprised, it takes money for fun between bonuses but at least I could get bonuses, and had quite a few 500x+ base game hits.