Any question answered...

So I've got some Shimano A530 pedals, and on the left one, the retention has started to go weird. Even when it's set really loose, it sticks quite a bit, allowing no twist movement without quite a lot of force. Sometimes if I clip out and back in again, this helps, but like 50% of the time it sticks. Cleaning and lubing the springs etc seems to help for a bit, but only like one or two rides and the problem comes back. I don't think it's worn cleats, as they are only a bit worn, and I don't get the same problem with my other pedals (M520). Should I just replace the pedals, or is there anything else I can do? Bit disappointed as they're only a year old and Shimano stuff is usually ultra durable.

These ones:

http://www.shimano.com/publish/content/global_cycle/en/us/index/products/pedals/road/product.image.+media+images+cycling+products+bikecomponents+PD+PD-A530_600x450_v1_m56577569830637299_dot_jpg.bm.512.384.gif

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