I agree with Velzey^^^^. I also have to wonder about the actual bedding. Some guys think since it's "pillar bedded", that's all that's needed. This is far from being the truth. Heck, even an aluminum bedding block isn't all that is needed. The action and stock should still be glass bedded, even if it's only skim bedded (as in the bedding block rifle). If the rifle is not sitting on those pillars squarely and is slipping back and forth (even ever so slightly) during recoil, this could be allowing those screws to lose their grip and start backing out. Blue loctite only adds a bandaid on top of a bigger problem. Sounds like a bedding issue to me IMHO.... Speaking of that, I am going to work on the bedding of a rifle that I bought yesterday. Not everything from the factory is perfect....How tight are you getting them?
And use blue!
I just had a Win 70 in that had red on the action screws. I took the simple route. Milled the heads off the screws.