Your Drive Is Good For About 3 Years And 9 Months
I hate to tell you this, but flash technology has a limited amount of writes in it anyway - And if my experience trying to recover from corrupted flash drives is any indicator, when it goes, for real, its gone. If it's a journaling/directory error, or a corrupted file messin with it, fine. otherwise, you're just about done.
Storage is cheap people. Back it up!