Geols430

Folks, I face a gear slip when I climb a slope to my parking area. Feels like a sudden change in the gear shift and missing the acceleration then it will go. Also while I make the car stop i can feel this sudden gear shift. Normal cases its fine and the gear shifts very smoothly. I had my major service done very recently. My 03 LS430 has done 220k miles. Can anyone suggest me what could be the reason. Really worried