It's easy to overlook some playable draws when playing over your optimum speed. Also, some machines have sticky or dirty buttons. Playing too slow. Find your optimum speed. Not joining the slot club.
Most casinos have a slot club, and membership is free.
You can be a long term winner at video poker simply by understanding and avoiding these errors. It's not hard to recognize the good games and learn the correct strategy for your games of choice. The moral is to play only the games that offer high payback, follow an optimum strategy, and always use your slot card. My Precision Play method make it easy to learn a winning strategy for some of the most attractive games. You can cut your loss rate to almost nothing, or even turn it into an expected win.