I've had similar problems with my TB, only had him a few months but had farrier out almost every week initially for lost shoes. Very thin hoof walls and flat feet (typical TB) so every lost shoe meant a bruised sole and a few days off work!
He's been on farriers formula since I got him and can...
I applied for 2x dressage (both days), xc and sj - only got the dressage days :( Will still be great to be there but thought they might prioritise those who want to see the whole event? Meh.