I have had places change their dealer rotation as a counter measure. Not to bring a dealer in to pref shuffle so much as too bring a very fast dealer in. That is a common early "counter measure". And of course the funny thing about that, is most counters have no problem keeping up and they are actually doing us a favor.
But really that "benefit" of that back fired, attempted counter measure is short lived. The bottom line is if a casino is doing this, then your play has gone outside of their comfort level and they will move on to more extreme counter-measures. You are better off to finish out that shoe and move on and re-evaluate the how to better stay within their comfort level if you intend to achieve any kind of longevity at this store.