Anybody ever heard of them seperating, mine did today, wow what a surprise, shot for a while put my bow down eat something came back and the Back of the limb was totally seperated about 6 to 8" above the bolt hole.

What to do now, is this repairable?

Send them back to A@H and i bet they will make it right.

I have owned several sets, never a problem. One thing to consider, never leave any bow with all black limbs hanging strung in the bright sunshine.
I have had other bows come apart when left hanging in the sunshine.

Don't think they should come apart left hanging in the sunshine. Hunted all day in 80 degree weather out of a tree stand and never had a problem with my bow.