As far as I can tell, were being ignored :*(
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Just happened to me after maintenance today, no idea if there is a weekly expiration or not on Star Gems. Was at 1100 and some and now i'm at 469. Also reinstalled the game beforehand so maybe that did something, just throwing that out there just in case that maybe the cause. Doesn't seem like anyone has concrete evidence as to why this is happening yet and the contact us page seems to be down as of this moment.