Ok, so I had to have spent the past 3 hours searching for how to fix this problem but honestly, I don't know what to search for. I just got a brand new SV Prestige and whenever I play towards the higher frets on the lower four strings I get this weird vibration sound. The note doesn't sustain, it just makes a "wah-wah-wah" sound like it's out of tune with itself or something. This also happens with my other guitar on the high e string and it's really starting to annoy me because it seems like it should be a simple fix. Please help, thanks