Initially later top flop 2

With some frustration I write these Rezenzion. What initially felt great, has now transformed after a few weeks use in a strenuous exercise. The latex (?) Head is suddenly soft and sticks to the surface, so I did only redirected with very finely metered pressure goal. Well, the letter, resp. The selection of the letters already works, but emphasize on the surface becomes a permanent nuisance. My friend uses a second copy and has exactly the same problems. Pity ... has probably looking for a new pin.