Sound on lg optimus t

[Shards]

I've had my optimus t phone got a couple of months now and even though I'm posting this now, my phone has a problem with the sound. Whenever I'm on youtube and watching a video on high quality, I always here a distinct crackling noise sort of like static. On low quality it's not there and it's not there for music and other media. If I send it in, they said I would get a refurbished phone, and I don't want to get a refurbished as I have had bad experiences with refurbished devices. Please help.
Thanks in advance

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