problems with the magnetic power cord on my new mac. anyone else with this?

i have a fairly new macbook pro. they switched the power connector to the one on the air. slim, dont you know.
but it seems like the thing only sticks when current is flowing. i keep plugging it in and coming back to find it has fallen off, onto the desk. this is fine as long as the thing is closed. but if i leave it open, the thing falls off, and i come back to a battery that is deader than when i left it.

it doesnt seem to click in as snappily as the old one.
this is starting to annoy me.