Mail app keeps asking for password
I've had my Macbook for a couple months now, and my mail app just started doing a thing where the icon jumps up and down on the dock. I click on it, and it asks for my password which is already typed in the box, so I just click OK. And often it just keeps popping back up to ask for my password. It's getting super annoying, and I don't know how to fix it. Please help!
MacBook Pro (Retina, 13-inch, Mid 2014), OS X Yosemite (10.10)