Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Foil distintegrated after 3 months of use - disappointing

I bought this as a Christmas gift for my 78-year-old father, who hadn't used an electric razor in over 25 years. He loved how it operated and the fact that you could rinse it off, and it gave a fairly close shave. After 3 months of use, however, he noticed that the foil was scratching him as he shaved. He discovered that the metal was literally flaking apart. We're hoping it was just a bad lot and will try to get a replacement, but I'm very disappointed to have this hassle to deal with.