must be an issue with that auto-detect feature for distinguishing between active taps and "just resting and device holding thumbs/fingers".
it does not really function.
in fact i loathe the much too slim rims of the X and the new 10.5 ipad.
the shop assistant in apple store "doesn't it look great? so elegant!"
i answered "but a plague for gamers. how am i supposed to hold that thing in portrait mode?"