I had massive issues with Airdrop 2 when it first came out. After many lengthy chats with Apple support it managed to resolve itself. All I can offer and a work

I had massive issues with Airdrop 2 when it first came out. After many lengthy chats with Apple support it managed to resolve itself. All I can offer and a working solution is signing out and back into iCloud on each affected device. This of course comes with the resync penalty.