astromech problem

[facboy]

hi,

i'm running the pc version, and i have a problem with the astromech. on some of the levels, you have to create a platform out of lego blocks using the force, and then hover from that platform using the astromech.

problem is, the astromech doesn't always hover...about 90% of the time he starts to take off and then sits down again, as if you've just tapped the button without holding it down. it only happens on the lego block platforms...r2 seems to work fine on normal ground.