FaceTime problem

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So you know when you FaceTime, you are allowed to multitask, right? The majority of the time when I multitask away from FaceTime during a call, when I return back, FaceTime is completely black and you cannot see the other user, and you have to exit the app, end it, and call them back. <--- so that's an annoying process, and especially if the person's wifi turns off at a specific time, but can for some reason can stay in a call, but cannot start a new one.
So any information, tips, or w/e, anyone else have this problem? Thanks in advance

 

Thank or replying, but that was COMPLETELY unrelated. My question was about FaceTime going dark when I used multitasking lol...