I handle as follows: I notify the credit card company fraud department that I will be making several purchases at whatever store I am using for say between $1k & $5k. They will note your account and you should be fine. When making the purchases, wait a couple of minutes between transactions. Too close together signals possible trouble like you may have left the card and someone else is using it. Also, change the amount slightly for each load. I follow these steps and never have a problem. These steps also work great when you are "training" a new card.