On knights and dragons game on my iPad when I watch a video to get free gems my screen flashes black and it quits out of it and I don't get gems because I can't watch video how do I fix this problem? I have tried redownloading the game, restarting the game and I have been waiting but it's been like this for 3 days I didn't do anything different when it started happening so I don't know what wrong does any1 else know because I rely need gems but I can't buy them
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