Issues regarding Arena Crystals.

Arena crystals used to be my go to place for getting units. Just by opening a batch of 10, I would at least get 25 units (usually more). But recently, I opened about 80k battle chips worth of Arena crystals and I did not get any units, just gold. Just wanted to post out here if anyone knows anything about this.
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Then maybe I didn't luck out well hahaha.
Still....80k of battlechips with no units is pretty brutal..
Just bad luck, I opened 10 and got 45 today
Yeah I guess that's what it is.