I'm on my second pair of these loved my last ones so much and they have really improved the fit etc

BUT I'm having a mare with the cleats...just cant get em to stay tight! Just about every rideone of the other works its way lose. 

Never had this problem before, fitted cleats loads of times.

Last night at the end of my ride...My so and I always race back to the house the last road section and down the short hill to my house...bombing down last night got to the gate and couldnt unclip at all...all happened so fast and I ended up toppling over onto the gravel road still clipped in

I ache all over, put my hand down and sprained my wrist and luckily my leg took all the force ( not the frame!) so thats a bit battered too.

Anyone else had any problems?