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Good question. But I believe the SM841 is equivalent to the 840 Pro, hence not affected by this problem.
No its a real problem, but Samsung hasn't acknowledged it yet: http://www.overclock.net/t/151...
Why about 100 foam plastic balls of orange color with a plastic orange flag and LED light (blinking for 3-4 months after contact with water) cannot be placed inside the fuselage on an aircraft which costs hundreds of millions? The size could be of a tennis ball, an additional weight and cost almost zero.
This is a great thought. If something like this works it would save tens of millions.