USB stick not formatted

The USB stick was meant to movies on a Samsung TV store. Went quite well initially. However, after a short time, about 3 months he could no longer be detected. So reformat. Did not go on Windows unfortunately, it requires a software manufacturer. After continued use, the problem occurred six months later on again. Now it was no longer on the software manufacturer. Since the stick was not cheap, it is all the more annoying. Had to stick bought for good rating at Chip Online. Unfortunately, such tests do not always tell us something about performance and durability. Would not buy this in any case again.