I use ginger about once a week, but I usually pick up the large roots from HMart and so they last a while. I read somewhere that it's pretty convenient to freeze ginger. I wrap it in plastic warp and foil. It's great in that it's easier to grate on the microplane, however it seems to have a less pungent ginger flavor. Not an off flavor, as if it picked up flavors from the freezer, but rather less gingery. Is this a sign that the ginger itself is going bad or does this happen with freezing of ginger?