Gotta agree on the Kindred Companions!! One of the best kept secrets in traditional archery!! I got mine last year. Only problem with them is they are so bloodthirsty.
I had the same thing happen to me last year. As I was repeating to myself, "I'm not gonna shoot it, I'm not gonna shoot it", the bow just took over. Next thing I knew my arrow was struck in the ground about 15 yards away with blood all over it.
I have only hunted one morning so far this year because I feared it would happen again and I would not get to hunt the rut. Luckily, "Tiger" (my Kindred Companion) must have still been a little groggy, being our first early morning hunt and all. Because a decent 8 point walked right through my shooting lane and I was able to keep the arrow on the string.