Android AdMob AdView disappears on rotate

Question

I'm having a strange issue where my AdMob AdView banner seems to disappear when the device is rotated. I initially solved this by setting android:configChanges="orientation|keyboardHidden|screenSize" on the activity in the manifest file. This worked fine until I made a second layout to use for landscape on tablets. The screenSize flag means that the phone will not dynamically show the landscape/portrait layout, it instead uses the same layout for the original orientation. Is there anyway that I can persist the AdView banners when rotating the screen without using this flag?

My xml is as follows

<com.google.android.gms.ads.doubleclick.PublisherAdView
 android:id="@+id/ad_view"
 android:layout_width="fill_parent"
 android:layout_height="wrap_content"
 android:visibility="gone"
 ads:adSize="MEDIUM_RECTANGLE"
 ads:adUnitId="@string/test_id"/>

The banner itself is loaded when the activity has received a response from the API for a network call, which is made when the fragment has been added to the activity.

@Override
protected void onResume() {
    super.onResume();
    if (mAdView != null) {
        mAdView.resume();
    }
}

@Override
protected void onPause() {
    if (mAdView != null) {
        mAdView.pause();
    }
    super.onPause();
}

@Override
protected void onDestroy() {
    if (mAdView != null) {             
        mAdView.destroy();
    }
    super.onDestroy();
}

    private void onNetworkCallSuccessful() {
        mAdView = (PublisherAdView) findViewById(R.id.ad_view);
        setupAdMobListener();
        Bundle bundle = new Bundle();
        bundle.putString("testKey","testValue");
        mAdView.loadAd(new PublisherAdRequest.Builder().addNetworkExtras(new AdMobExtras(bundle)).build();
}

Any advice would be greatly appreciated.