yep. sounds like target panic to me. Get real close to your target, like 5 feet, draw, close your eyes, and focus exclusively on the release itself. Making sure you follow through correctly, and you are squeezing the trigger, not punching it. The idea here is for the release to not only be a surprise, but also, if you are not looking, you retrain your eyes and body to shoot simultaneously. They are both "looking" at the same thing. Give this a try and see what happens.

Focusing on follow through is another technique that may help. Try to keep the pin on the bulls eye until after the arrow has hit the target.

Had the same problem myself. Recently I took the peep sight off my string and use a kisser button. With my sight, I removed the bubble level that came on it and went to only 1 pin. This seems to help me concentrate more on my target with less other STUFF to worry about.
Since I did this my groups are better and I can hold on target longer before I release. Dont know if this would work for you but it did for me.

I have been experiencing target panic lately and a friend of mine borrowed me a back tension release and showed me how to use it. One thing that really helped was to do the shooting at a target at about 5ft or so and closing my eyes and experiencing what a true back tension release feels like. My release is a wrist release and reducing the distance on my trigger so it fits in my middle nuckle, not at my finger tip, helped me from "punching" the trigger and forces me to squeeze the trigger. I'm focusing more on the target, not on my release. My shooting has improved dramatically.