If you start with a slot that has given out a huge Jackpot - be careful. If the slot is still »hot« - it depends on many factors. Even better - start with slots that has recently given out some mid-level amounts (100 - 300 €/$/£).
In any case our team recommends these steps - here is an example of a 5-reel, 20 lines slot:
1. First spin should be a bigger one - (let's say 1 €/$/£). First spin could be a good one, as someone just seconds or minutes ago might have lost an amount. So it's better to risk a bigger amount.
2. If the first spin is good (winning bigger than you bet), don't risk too much, but lower a bet to 80c. If it's good again, you're there. You have a good slot, but you still have to make some more checking.
3. Try to lower your bet and your betting lines. Generally, if you get winnings almost every time you change the bet, you very likely have a good slot with great mapping at the moment.
Keep in mind - at online slots it can be very tricky - someone is playing on his computer at the same time as you are. He might just have more luck and might have stolen you a bonus game in front of your nose. If the slot suddenly changes it's behavior, exactly this might have happened.
Therefore - you should try playing outside »rush hours«. You'll be able to play without risk of being outrunned. Still, it has a downside - nothing will be happening, so no new incomes will come in and you'll get only what other left during the "rush hour" play.
Finding a »hot slot«
Try to find a slot, that has given out such amount two times today at most (not more). And if it was 3-5 hours ago, you might be in luck. Every player plays on, as he hits some winnings. In the meantime, the winnings just might have been already returned, but the machine is still potentionally in a good phase, as it has given out some amount today.