Shuffle up, change the cards, change the dealer, close the table, etc etc etc
Though there should be someone in that casino that actually understands the math behind the casinos advantage, that person usually is not the person watching your table.
Wild swings that have nothing to do with advantage are just a natural part of blackjack but uneducated, superstitious pits can react to them in ways that make you know that their knowledge of the game is no different than the average player's. There again, there is also the paranoia that something is going on, he can not grasp what it is and may land up in trouble with his bosses if he can not explain or put an end to it, so he pulls out all stops.
They shuffle up, but lose on the next stack.
They change cards but still lose. Well, perhaps the dealer is working with players.
They change dealers but still lose.
The eye reviews play and can not see anything.
The luckiest ploppy on the table is told no more blackjack and is totally dumbfounded, but the casino continues to lose.
"We have got to put an end to this", the unknowledgeable boss states, so he closes the table, pisses off all of the players and he feels he made the right move to SAVE HIS JOB!
The players now angry move to the next casino and lose back all that they won in the first casino.
Too many table game supervisors are just as superstitious as their customers and too fearful for their positions to just let the game, time and the casino advantage to take care of everything if there is no cheating going on.
ihate17