EaseInTop Flickering

I have several slides that should perform seamlessly, but I continue to have a flickering issue – inconsistently.  After the slide transitions, a word fades in (.03 sec), then EaseInTop (1 sec duration) set to appear 1 second after the slide starts.  On some runs, it is beautiful and functions as intended.  However, during some presentations, it flickers at the end position, then fades in and eases up.  Because of the inconsistency, I am stumped.  Any thoughts?