Look Keo pedal no longer floats. Can it be fixed? I've had look Keo pedals installed on my road bike for a few years. Recently the right pedal has felt like it no longer has any float (potentially seized up?). This is starting to cause me foot pain on longer rides, so very keen to solve it before it leads to injury.
The cleats I'm using are only a few weeks old, so I can't see how it would be those causing it.
My main question is whether there is a way to service pedals to fix this? I know the axles can be serviced quite easily. Otherwise, is my only option to replace the pedals?

I have tried old and new cleats in the pedal and in the other pedal (Which seems to be fine). I use the grey Keo 4.5 degree cleats and always have done.
I've tried putting the left shoe into right pedal and vise versa, and it appears that the problem is pedal specific (Right shoe works in left pedal, left shoe doesn't work in right). I believe it was an issue before the cleat change, the same foot pain existed, but I didn't know the cause. I've checked for for stones/muck, both pedals are clean and clear of debris.
As a follow up question, what are the reasons that would make you change your pedals? Could this be caused by one of those reasons?
Put some soap on the cleat contact points to lubricate it.
Be careful not to get it everywhere, just in case it becomes too floaty!
This assumes you have covered a bunch of other options (of course!)

The cleats are actually the same and you didn't mix-n-match (some other manufacturers make compatible cleats which might be slightly different)
The black protruding insert is not different / damaged / inserted incorrectly.
All the caveats above regarding dirt etc.