Don't blame you there! FWIW, I have left my 436HP on for up to three weeks & haven't had any issues. I did experience this issue when I failed to remove the mass storage device aka my 436 from windows & just yanked out the cable. After formatting & starting over, knowing my mistake, I tried again & sure enough the card was botched! Ever since though I always remove it from within the OS & have never had another issue.