In reply to rich_hw: The problem was found on a variety of ropes and in different circumstances therefore it is difficult to provide details of each. And because this device has so many potential uses, abuses and misuses it's impossible to test each and every variation. Also the reason we did not is that if we don't list a particular circumstance it may encourage people to keep their device thinking
'they haven't mentioned the way I want to use it so I'll be safe'.
Obviously, we also do not want people to do that as it is essential people return them all.
Basically it doesn't work as it should and we need people to return it that's the very non vague bit.