Or are you queenless in that hive?
If you have a queen she is maybe shutting down due to lack of nectar flow.
If you have a nectar flow and a queen and there are nearly full frames in brood box shift them up and give undrawn to brood box.
Very hard to comment as this is a situation where you need to be on the spot and assess all the factors to draw a conclusion.
Sometimes if confusion reigns then walk away and have another look in 7-10 days for more signs, quite often it becomes clear to what is happening.