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.
"I call suffering my brother. I love him like my mother. We look out for each other, we'd die for one another.
I fight, I brawl, I feind for this. I scrape, I crawl, I bleed for this.."