Bad Input Values for Rotation on Object with 5+ Children

I'm converting my project to utilize some unity 4.3 tools and am encountering errors on objects that are the child of a rotating object. When this object has 5+ children the children start throwing the error:

transform.rotation of 'object' is no longer valid due to a bad input value

And:

Quaternion To Matrix conversion failed because input Quaternion is invalid

I've been able to narrow it down to specifically 5+ objects. If I remove the rotation code for the parent object I don't' get the errors--unfortunately the rotation is vital to my game.

Here's the code that rotates it:

     protected void Rotate() {
 
         if(catnip > 0) {
 
             catnip -= Time.deltaTime;
 
             theSpawner.spawnTime = .5f;
 
         }
 
         else {
 
             catnip = 0;
 
             theSpawner.spawnTime = 1f;
 
         }
 
         float catNipMod = catnip > 0 ? catNipForce : 1;
 
         float rotateSpeed = flip * (catNipMod) * .1f * (collected.Count + 1);
 
         if(rotateSpeed > 1f * catNipMod)
 
             rotateSpeed = 1f * catNipMod;
 
         transform.Rotate(0,0,rotateSpeed);
 
     }

Basically I modify the rotation speed based on the number of children (the collected.Count) then I rotate around the Z axis.