I'm assuming you're using some form of custom firmware (given that you're able to format flash1 & flash2)? I'm not particularly familiar with custom firmwares newer than 5.50 GEN, generally I would recommend using the same installer you used to install it in the first place to re-flash it to flash0. If that doesn't fix it I would bet it were either an issue with that particular custom firmware itself (in which case you'd either look for/wait for a patch or try a different one entirely), or a hardware issue.
"I think that the problem with this video is it is highly derivative of many popular bands within the genre. Although when viewed on its own merits, it does have a deeper groove. However what it has in groove, it lacks in originality. One can't help but be reminded of such bands as Pearl Jam, White Zombie, Suicidal Tendencies and other bands that bear the mantle of so called "Alternative Rock". One is even reminded of Lorie Anderson when she wore curlers. Hehehmhm! This video speaks less to the heart and more to the sphincter. In closing, I think Korn would do well to learn more from -"