While I completely agree with you that it seems an unlikely failure there was a translated comment in the video that said something like transmitter unilaterally failed on one side or some such thing but I have no idea if it was translated correctly or if the person posting the video actually knew what really happened. I guess anything is possible as there is no such thing as a perfect system. I'm not going to worry about a single online video as there are similar videos around for pretty much every system in existence. Now if there are a number of similar failures reported that's a different story but I haven't heard of any so far.