Resume Revisited state to base slide, when layer was the last visited

I have a slide that has a base layer and then 4 layers that are triggered by buttons from that base layer. After learner clicks the button on the layer it gives them some information about that portion of the course they are about to learn, after clicking start it then take them through several slides teaching them that content and then triggers them back to the base slide with a button. The problem I am having is that when they return to the base slide to click on the next section it replays the last layer they visited.  Any suggestions on how I make it go to the base layer so they can resume to the next course section? 

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