When I chop samples in Loop/slice Multi mode, I run into this problem quiet often.
I set up the slices I want with the faders. I zoom in in various scales, depending on how precise I need to be. If I go back and want to edit a start or end point on a slice, the start or end point jumps far away from were I were before when I move the fader just a little bit. So I have to set it up again.
Hope it makes sense?