Yes, I've been experiencing similar delays, related to Delta fans.
An order for two 60mm DC fans was placed on 2/16 @ 8:30am, and it's still showing as "Unexpected Shipping Delay."
Tried calling them on three separate occasions, with the same answer: For whatever reason, the warehouse can't seem to pack the order. (Latest update is that the warehouse is short on pallets, apparently.)
Very disappointing, given Digikey's size and reputation. Sigh...