There's a ton of stuff on line about this, Catrin. It happens in different varieties, I guess. I read some very nasty comments!
I would call Speedplay myself.
2015 Trek Silque SSL
Specialized Oura
2011 Guru Praemio
Specialized Oura
2017 Specialized Ariel Sport
I don't know what a worn out Frog cleat looks like, Catrin. You might ask on MTBR. Granted, some of the reviews and forum comments on MTBR relate to different model years, but there are certainly numerous comments about the cleats wearing out prematurely. So, I still think that's the the possible source of your problems. One commenter said that when the cleats are done, they're done. There's nothing to adjust to prolong their life. It seems to me that after 2k road miles, Speedplay should replace the cleats for free.
Live with intention. Walk to the edge. Listen hard. Practice wellness. Play with abandon. Laugh. Choose with no regret. Continue to learn. Appreciate your friends. Do what you love. Live as if this is all there is.
--Mary Anne Radmacher
Jonathan has checked everything out and he said that the cleats are in pristine condition, no signs of wear. I did call Speedplay this afternoon and they are sending me something to install between the cleats and shoes that should fix the problem. It is an "elastometer"? That probably isn't spelled right, but it is a warranty item and after he carefully questioned me regarding what is happening he was quite confident that this would fix the problem.
He did say that the lifespan of the cleats are from 2,000-5,000 miles depending upon riding conditions. He doesn't think this is the problem once I described my riding conditions - they never get wet/muddy/dusty, aren't used mountain biking, etc. He also said that if the small rear limit screw is overtightened then that prevents the crown from fully engaging and causes the same problem. If I trusted my hand strength I would install the "whatchimacallit" myself, but I don't so will have my LBS install it. I won't ride my Gunnar until this has happened, it just doesn't seem prudent. Hopefully this will fix the problem!