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Lobsters molt and they can do this mostly at certain times of the year but it varies according to temperature and the species. If the lobster you are about to buy has give in the shell or is soft do not buy it. The colder the water the better the lobster.
I lived on the pacific at a spot where lobsters were plentiful. I never caught a soft one. I never cooked one that was dead. Lobsters have an antifreeze and will stay several day alive even at 4 degrees F in your freezer (they just slow way down).
Many places sell lobsters from pens. These may spend some time there. While there, the lobster is losing mass in its flesh. The longer in captivity, the less desirable these become unless they are being fed a proper lobster feed.