As far as i can see, those low clocks are what the card uses when it uses it's "dynamic power management" feature. basicly what that does is lower the clocks when the card goes is not doing anything demanding. this obviously saves power. it appears thats it is stuck in this "power saving" mode. What you could do is download something like MSI Afterburner and manually set the clocks and apply them. Might work, might not but worth a try.
Maybe you could do a little OC'ing while your there