Star Wars Trilogy Crosshair Jumps to Centre

Hi guys - as per title.
When I be play Star Wars Trilogy the crosshair regularly jumps from it's current position to the centre of the screen
I'm using a GRS Star Wars yoke, which seems to work fine on all other games.
Cheers
Paul.
When I be play Star Wars Trilogy the crosshair regularly jumps from it's current position to the centre of the screen

I'm using a GRS Star Wars yoke, which seems to work fine on all other games.
Cheers
Paul.