IBM Worklight - What are the circumstances that might lead to "onInitWebFrameworkComplete" not getting a callback?

Question

We have an IBM Worklight Android application where our class extends CordovaActivity and implements WLInitWebFrameworkListener.

According to worklight documentation we initialised the following in onCreate()

WL.createInstance(this);

WL.getInstance().initializeWebFramework(getApplicationContext(), this);

However there are certain times where we are seeing

public void onInitWebFrameworkComplete(WLInitWebFrameworkResult result) {}

is not getting called, and hence we are seeing blank pages. Its intermittent and not reproducible everytime.