I recently installed a new stock. After bedding it the trigger freezes 90% of the time when I load a new round in it. I've increased the trigger pull, cleaned the gun multiple times, tried multiple lots of ammo ( factory and reloads) and it still locks up.

When the trigger freezes, I can see the trigger slide back when it locks up.

When the trigger freezes, if I open the bolt and close it, it fixes the problem.

What am I misssinng?