I know how you feel mate, it’s one of those slots that can just ruin a session. I would never recommend staying on Book of Dead for more than 1 bonus as it can just rinse the balance. I normally play it on 5 lines to try get a decent hit in the base game. I’ve had sessions on it where I land 4-5 bonuses within 100 spins then sessions where it’s gone 600+ spins without one. I play it quite a lot and I’ve seen a fair few bonuses but generally your lucky to get 100x back from it, on rare occasions I’ve got 200-600x but bonuses without expansions occur much more often than that.