Seen it myself, have been there. Reformatting did not solve it. On the other hand, the stick until today works reliable. It is a Transcend Jetflash.
Don't worry, and make it a habit to replace a USB stick after 5-6 years anyway. I just have lost one that was a backup storage and has not been touched since 4 years. Also, a Transcend Jetflash. I mean, this is a trusted model. I have many of them with 32 and 16 GB.
For important longtime storage,a HD is better than a stick anyway. Even if the electronics break, specialists could maybe save data from it in their lab. From a broken stick you can save nothing.
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If you feel nuts, consult an expert.
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