Only until you gain one level higher in your new class than what your old class was. At that point, you get all the previous class's abilities back and use whichever saves are the best. For instance, I dualled a 9th level berserker to a thief. His saves sucked until he got to a 10th level thief.
Don't worry...they'll come back...after awhile!
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Now where did I leave that doughnut?!