I have discovered over the years that I can solve most, not all but most trigger freeze problems.
If your radius on your gun is a little large or the palm swell is a little on the large side etc it can cause you to grip very tight with the trigger hand causing tension through out the wrist. Coupled with the anxiety etc and almost always having a wrong trigger finger position on the trigger, the result is often a flinch or a pulling of the muzzles in a downward direction as the trigger is pulled, missing underneath.
The way I have solved this is:-
Just for a second or two, hold the gun in your front hand only and as near flat as you can but not quite.
Then put your trigger hand open on the side of the stock but just behind the pistol grip.
Then slide the open hand up to the pistol grip leaving it open a little and putting the finger on the trigger.
While you are doing this the stock toe should not be lower than the elbow.
The trigger should be placed half way across the first pad (the one with the nail) and not in any joint what's so ever.
Once you can feel the finger pad touching the trigger you can then gently close the hand fully but not too tightly.
This will take all the tension out of the wrist/hand and will usually result in a very sleek and smooth trigger pull.
People that mount with the back hand doing all the work can often suffer from it as well as the hand is too rigid/tight. Game shooters in particular as they hold the gun in the air with the trigger hand and the wrist gets stiff. They lower the gun with the trigger hand into the front hand and shoot with a very straining wrist a very tight grip and the trigger in the first joint......"oh dear".
You can also do it as part of your cage/stand routine to help you relax before calling pull if you suffer from flinching.
Try it.