Power bank worked previously, won't charge my devices anymore?

A

AC Question

I'm not really sure what the problem is here. When I charge my power bank, it will charge up. However when I plug in a device to my power bank, my devices won't charge. When I connect my phone (Galaxy s6 active) the screen will light up, but won't show that it's charging. Same problem with my tablet. I've tried turning the devices off and connecting but still, no charge. The power bank did with before with no problems. This just happened out of nowhere.
Any ideas?
 

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