I agree it does sound like target panic and there are countless hours of reading on the net on the subject and the one thing you will keep seing come up is a backtension release.Do it before it is too late.I know you may not plan on using a release like that for hunting but it is a crucial tool for a hunter and archer to LEARN proper release form.
Another thing that can cause your problems is having a draw length that is too long.Get it checked and fixed (if it is the problem) before it cause serious form issues along with bringing on the dreaded TP.
GOOD LUCK