well mine was from Farnell, so you'd hope that they were genuine.
According to the Farnell link you posted above, it's no longer manufactured, so it must've been a bad/defective design from the start. I'm surprised a supposidly good brand would let through such a shoddy design.
That is what amazed me, 3M are not cheap, you expect their stuff to be good, I was doubtful at the time and only bought it as it was made by a brand such as 3M. I was recently looking for some kapton tape, ahem i mean poly-something tape....... I soon found that kapton is likely a trademark of 3M and it's dammed expensive like 5x or more the price of the same thing calleh poly-something.