My wife bought me a Microsoft Lumia 640 Smart Phone, running Windows 8.1 LTE, in September 2014. She also purchased a 128 GB Samsung SDXC card to use in the phone. The phone and my laptop both recognize the card as a 128 GB card, but when I add videos to the card through the phone or the laptop, the phone and that laptop only recognize the first roughly 10 GB of videos that are loaded first and then the phone and laptop do not recognize the format of any of the video files after that and will not play the videos. Any assistance will be greatly appreciated.