So ideally the machines in the slot casinos games are configured on some feasible winning and some of loosing?
I am not in doubt because there are actually strategies you may apply while using a particular computer system while playing the slot and you won't win and same techniques could be applied when switched over to another computer system and you could win.
From there some players would always assume their luck to be on that particular computer system. So at their unaware some reconfigurations would be done over night where the player comes other time can not be possible to win ahead like the other times.
We cant be able to draw up some conclusions in regarding if they would be trying out to configure it out but there's always that possibility because no casino would really be letting these things to happen continuously as if these things will really be resulting that huge effect into their overall profitability.
It is really that a normal behavior of a person on staying up on a machine specially if he had been able to experience some huge wins but same as you said that there might be some tweaking
with those machines and avoiding those similar unreasonable wins on which this is something an understandable action that they might do but actually accusations something like this
isnt really that solid because we are just basing our own hunches on how they would react out.