Most of the time the casino takes the money. But when the winning session comes, on this day many slots give you a solid win, it is impossible to lose. This successful session can last several days.
As soon as this ends, absolutely all slots begin to take money.
How do you win and lose?
It's just your observation, not a fact, Every gambler have different experience and results, and not because you have this in your dashboard you will conclude that it is and, it is better to give us a chart of your experience to back up your claim based on your experience.
I never analyzed this or assumed that there was a case like this maybe because I am enjoying more than analyzing we all have our ways of treating gambling, other wants to have fun, others to make money other analyze their experience.