Sounds more like a lens problem. Does it act that way with other lenses?
When you say they are stuck, are you triggering the shutter and they aren't moving? Just to make sure, are you trying something like f22 or f16 and a slow shutter like 1/2s? This way you can make sure you had a chance to see it.
Sounds like you'll need to open the lens (what lens is it?), and clean the blades. Can be a simple job to an absolute nightmare, depending upon the lens. Youtube will be your friend here.
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