I won $12,000 on 11-05-11 and decided to wait for that payout before i played another machine. While waiting for my payout a machine technician walked up to my machine paused, said nothing to me and moved to the middle of the high stakes room and stood there. I received my payout and moved to a different machine, inserted my money and the first play on max credits the machine tilted. I waited for the attendant to reset the machine removed my money and went to another machine. I did notice the machine tech was still in the room at a location that he could still observe my play. I inserted my money in a different machine, first pull and the machine tilted again. I was very surprised that the machine tech did not come over to check out the machine, he stood in the middle of the room and let the attendant reset the machine. This happened to me on the third machine without the tech talking to me at all. Before i hit the $12,000 I played for 8 hours and not a single machine in the room tilted, and people played all the machines that tilted on me prior to me playing them with no problems. I decided to leave the casino and I don't want to return to this casino again.