[Moderator] I have moved this question into its own thread as not to hijack someone else's thread.
Can you Elaborate on what model of IGT Video Poker you have ? is it a PE+ a Game King etc ? and do you know what model of bill validator you have.
Does the validator accept bills ?
If you don't know the model etc - please post some pictures of your machine both outside and in.
Typically what you describe sounds like a power supply issue. The validator briefly loses power and then goes through an initialization sequence when it gets power back. Without more detail as requested above its hard to be specific but you might want to try reseating all the harnesses at both the validator and machine end and see if the problem goes away.