Bit odd, from what I've seen he's in his worst period of form since he's been at Palace. Think he was injured a lot though last season, and he was great for them in his first 5 months or so.
The football he missed because of the drugs ban must have been such a kick in the bollocks, a European final, and then the only chance he'd have had to play a home international tournament when he was starting pretty regularly for the team if I recall.