Well, you should never flash firmware unless you have a very specific need or reason to. Flashing firmware could always trash your drive. You have to decide whether you need the update badly enough to risk it.
As Max von Sydow's character in "The Marathon Man" asked, "Is it safe?", my reply is, "No, it isn't safe, at least, not in an absolute way." There is always risk.
In your case, since you say that your drive has been giving you problems, then you might as well flash it. If something goes wrong, it really doesn't matter that much, since you would have ended up needing to buy a new drive either way.