As someone playing on PS4 who doesn't use the hive myself but plays with squads who use it quite often, I've noticed that sometimes when I get downed and my teammate throws the revive hive at me, it will start to revive me by filling up the circle halfway, but then will seemingly stop before it fully revives me. It only fills the bar halfway before it stops firing revivers and then doesn't do anything. Also, the hive seems to only be able to revive one teammate at a time, as I was playing a mission last night where two of us were down around a corner together, our teammate threw the hive to us, but it only revived the other teammate and then stopped before it could revive me. Not a very good skill if it stops working halfway through a revive or only revives one person and then sits there.
Thank you for letting me know :)