Fleet arena store hasn't refreshed

I've been at 64/65 for Tie Advanced for 5 or 6 days, I've checked every refresh for each of those days and Vader's ship has not appeared once - it's been Slave 1 and regular TIE's only. How is this even possible that Vader's ship could not show up even once during those 5 days?

It's like the game knows I am only one away from leveling and it's trying to force me to use shards!