Every slot player has a theory. This machine is hot today. That one hasn't paid in hours, so it must be due. Switch machines after a big win, because it's "used up".
None of it holds up. Every spin on a regulated slot is decided by a random number generator at the moment you press the button. The machine doesn't remember the last spin, and it doesn't know how long it's been since a big win.
What the rules say
In Great Britain, the Gambling Commission requires game results to be "acceptably random" and "unpredictable". It specifically bans games that change the probability of outcomes during play. A slot can't tighten up after paying you, or loosen up because it's been cold. Other regulated markets have similar rules.
Why streaks feel real
Random doesn't mean evenly spread. Take a slot that pays something on about 1 spin in 5. The chance of 20 losing spins in a row starting on any given spin is only about 1%. But over an hour of 400 spins there are so many chances for a streak to start that you'll see at least one 20-spin dry run in about 6 hours out of 10.
So cold streaks happen to almost everyone, almost every session. Then a win arrives, and it feels like the machine "turned". It didn't. The odds were the same on every spin.
The one thing that does change
Your losses do. The house edge applies to every spin, hot streak or cold. The longer you play chasing a machine that's "due", the more you put through it, and the more it keeps. See what that adds up to on the slots calculator.
Sources
- UK Gambling Commission: RTS 7: Generation of random outcomes