So i started playing Through the Fire and Flames on expert...

After so much practice, out of nowhere, i finally passed the intro with flying colors. I was so excited because i knew i could pass it. I was playing through the song and out of nowhere, during the twin solo i noticed i was on RED and i didnt have star power so i went crazy and i failed. I was so mad that i quit and walked away. A few hours later i tried playing it again, i probably tried about 20 times, and i could't get the intro down. I have no clue what happened. Now i don't think i'll ever pass this song. Got any tips to what happened to me? (For the intro, i strum with my elbow, i keep my left hand on the first 3 fret buttons and my right hand on the other 2). Sorry for having such a long story, i just wanted to be specific.