Coroutines white death causes?

In my project I have a wide usage of coroutines and playmaker FSMs. At some point in the execution of a scene something goes really wrong: suddenly all coroutines stop without any error, after this occurs some FSMs get disabled after a trigger event. The only way I noticed the coroutines are not executing anymore is by their lack of effects and through the Monodevelop code debugger, I placed breakpoints in said coroutines and it didn't stop there.

I wasn't able to find any code responsible for this, also because I don't know what to look for. As far as I know, to kill all the coroutines in a scene it would take a .StopAllCoroutines on every script in the scene, no such thing in my code.

Also, there are no in-game events that match the particular moment in which the wild bug appears.

I've also tried my project from another pc. The bug there just doesn't show up. I then tried to re-install unity, have a clean clone of the project from repository and it still happened. My next attempt will be to use a virtual machine to install unity and test for that bug in the new environment... please help!

Here is the code from one of the coroutines:

     protected virtual void OnEnable () {
         initialize();
         StartCoroutine (slowUpdate());
     }
 
     public virtual void initialize(){
         if (debug)
             Debug.Log ("baseInvaderMovement initialize:");
     }
     
     protected virtual IEnumerator slowUpdate(){
         while(true)
         {
             if (debug)
                 Debug.Log ("BaseInvaderMovement slowUpdate Interval (speederInv):"+slowFrameInterval);
             
             yield return new WaitForSeconds(slowFrameInterval);
             slowUpdateCycle();
         }
     }
 
     protected virtual void slowUpdateCycle(){
         if (debug)
             Debug.Log ("slowUpdate Interval (baseInv):"+slowFrameInterval);
         //do stuff on gameobject
     }

If this script is disabled and then enabled it will execute a single time its slowupdatecycle and then die without a word again. Precisely it dies on the yield return new WaitForSeconds instruction.