my problem was a clutch sensor when there was no click or sign of the starter. Ive also one time one the m3 had a bad BST cable.
But narrow it down until you have the starter to replace.
"Driftin' away like a feather in air. Letting my soul take me away from the hurt and despair.
keepin' it vertical, forever elevator. Riding that escalator to something that's far greater.."