Make sure the power brick that your powered hub came with is capable of powering the N+ devices you have at the same time. Most of the 4 port hubs come with 2A

Make sure the power brick that your powered hub came with is capable of powering the N+ devices you have at the same time. Most of the 4 port hubs come with 2A power supplies, however sometimes they skimp on actually being able to deliver that power.