No. I had an axle snap when JRA (admittedly on singletrack, but still gently). Every bike shop I went to (I was on holiday) was amazed because they never break and consequently had no spares. When I got home my LBS was amazed too and so were Madison, so they gave me a free replacement 🙂
A route you could try pursuing.
Oh and if it were a crash the thing would be all bent and scratched at the break. If it’s a clean break it’ll be obvious. Plus they should be able to stand being clouted on rocks since it happens all the time – I’ve smacked the bejeesus out of every pair of clipless I’ve had, and that has never happend 🙂
However those pedals look a damn sight more than 4 months old!