I had that happen on my new 10/22 Annivesary model on its first outing. I cleaned out the new rifle of all its shipping goop, worked the action and trigger several times in my shop, and went out to the Shootin' Hole to sight it in. Bolt wouldn't release. Take off the gloves - Nope, no way. Bang the butt against the ground - uh-uh, no go. It did release now and then, but it took me almost a half-hour to shoot off 50 rounds of ammo. When I got it home and back in the shop, it worked fine again. So..."upon further review", I came to the conclusion that shooting in 25° temperatures was detrimental to the stop's ability to depend on gravity and spring pressure to fall out of the way and let the bolt fly home.
I disassembled the trigger group and blasted brake cleaner through and over all the parts, and lubed it up with Rem-Oil instead of the CLP I originally used. I also modded the heart-shaped cutout to allow for auto bolt release, and it's worked like a champ ever since.
With the advent of warmer weather on the horizon, this shouldn't be a problem, but when cold weather comes back, it's back to some thinner lube. I'm also considering using Mobil 1 of the 5W20 flavor to slick up the trigger group.