Bumping out of 2nd

Hey guys its not an all the time problem and not a big deal at that,
My 833 shifts fine and all seems good but everyonce in a while when im going up a hill and then go back down and let off and let the engine slow the car sometimes the tranny will jump out of 2nd. Push clutch in and shift to second no problem, usually its not a problem cause one hand is always on the shifter. Anyone have this minor issue? Just curious