I know this thread is old but thought for the good of the cause I'd post for people so they don't have to go through all the experimentation I did.

I had a click going on intermittently on crank rotation over the top on the early part of the downstroke. I figured it wasn't some other issue as I eliminated all the typical items and took the thing apart like I do regularly to prevent these things. It clicked both when standing and sitting too and when unclipping the left shoe and pedaling hard it didn't click either. So typically the issue with these pedals can be as noted below: Poor positioning of the base plate or it being loose. Make sure it is flush to the shoe and tight enough within standards. Then make sure cleats are newer and lubed and screws are tensioned properly (not too tight that can cause them to click due to great likelihood catching on the metal frame of the cleat. Usually that has solved it in the past. Retested still did it. I read below another person mentioned bearing possibly being the issue. So then I took off cap end off the pedal, re-lubed pushing old grease out the other side until it was cleared popped the cap back on cleaned it up and retested. It went away. I re-lube annually but have been riding a ton this past year so likely the grease was older and dirtier than normal and it seemed like there was a little less in there than should be. I think the bearings might have just needed more grease in there. We'll see how this holds up hope I can milk them for some more quiet miles. I might have ruined the bearings by not re-lubing them soon enough (rebuilt them last year so hoping not). If they click again I'll either re-build or be lazy and get new ones knowing I have to more attentive to them. Love the pedals and set up but the cleats and pedals are high maintenance. They, however, have longer spindles available for those who have wider hips so as to allow the proper Q angle. The ability to adjust the cleat positions on the bottom of the shoe are excellent as well.