Facebook friends temporarily disappearing from my friends list!!! ?

Ok so every now and then a friend of mine on Fb will suddenly vanish from my friends list (even though the total number of friends I have is exactly the SAME!) And is totally unsearchable. Sometimes its my best friends so I don't think they could be blocking me then unblocking, so what do you think is causing... show more Ok so every now and then a friend of mine on Fb will suddenly vanish from my friends list (even though the total number of friends I have is exactly the SAME!) And is totally unsearchable. Sometimes its my best friends so I don't think they could be blocking me then unblocking, so what do you think is causing this to happen? It happens regularly x
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