Actually, it's saying "Low Voltage":the voice quality on the Baofeng radios is pretty lousy, and some of them are worse than others..
And when I say some of them are worse, I don't mean certain models, but certain units.
Others have heard similar stuff.
And not only on the uv-82-but some other Baofeng radios(often(but not only) uv-5 series).
Some people have heard this as "little brown tits", or "little gold tits", or even "robo tits".
So most likely not malware(it's probably not even possible, as I'm pretty sure that the voice files are stored on a one-time programmable IC, so malware should not be able to change it).
This is the same reason why firnware updates are not possible on most Baofeng radios.
So it's probably not fixable-perhaps the dealer might be willing to offer an exchange if it bothers you enough.
Or-sell it to someone who does not care, then use the proceeds to buy another unit, hopefully with clearer audio(it's unlikely that a another unit will have the same issue). ?