Unity video Ads stuck, DEBUG [T:0x74262000 M] -[UnityAdsVideoViewController videoPlaybackStalled]:334

I am trying to integrate UnityVideo ads into my iOS game made in SpriteKit and It appears the integration is successful, I followed http://unityads.unity3d.com/help/Documentation%20for%20Publishers/Integration-Guide-for-iOS

Now when i try to play test ads On my device the video ad plays for 1-2 seconds and then gets stuck forever in "buffering" state

Following gets printed in the console continuously......

DEBUG [T:0x74262000 M] -[UnityAdsVideoPlayer _videoProgressMonitor:]:257 VIDEO MOVED: 0.000000

DEBUG [T:0x74262000 M] -[UnityAdsVideoPlayer _videoProgressMonitor:]:259 VIDEO STALLED!

DEBUG [T:0x74262000 M] -[UnityAdsVideoViewController videoPlaybackStalled]:334

I got this response from Unity, via email. It may help you:

Usually the VIDEO STALLED message is caused by poor network connectivity. What this means is that your app does not have enough time after initializing the Unity Ads -system to cache ads and it tries to fall back to streaming mode.

There are a couple ways to solve this:

1. You could allow more time to pass inside your app after initializing the ads before calling the first ad.
2. We could disable ad streaming for your game. What this means is that it'll force the devices to cache the ads first. This of course means that it takes a little longer for the ads to become available.