In general, you should be aware that the "life remaining" indicator may merely be the "warranty remaining" indicator. If the unused reserved block count isn't approaching zero, a drive can usually keep operating long past the official write endurance rating. However, in addition to the above bug, Intel is also known for putting a kill switch in their SSD firmware tied to the "life remaining" counter, so you might have actually experienced the SSD going read-only when that hits zero.