I don't know what has caused me to start snap shooting,  but I have got in the habit of this so how do I get out of this and start anchoring before I release. ....any suggestions. ..thanks

Might research "target panic" and see if this applies to your situation. I would also concentrate on drawing , reaching anchor , hold for 2 seconds and release. Just be sure you are not collapsing your back tension while holding.

A few things that work for me are
1. Shoot up close like 5 to 10 yards max , most of the time its a confidence thing so shoot some good slow shots up close with only one arrow
2. Get a light weight bow or even a compound bow and pratice with it up close for a while , again using only one arrow
3. While setting around in the house pratice pulling your bow to full draw and holding 3 to 5 sec.
4. Dont shoot at bullseyes , shoot blank targets like haybales or solid black targets

Mike