So we're talking about games which you have played before, completed before, and liked. You liked them so much that you want to replay them. And you still have the games and have tried to replay them. But for some reason, despite truly liking a particular game, you just can't complete a new playthrough of it.
A personal example of this is Final Fantasy VII. I did like FF7 - I still do. It had problems, yes, and more were added by Sony's localization. But I still like the world, the story, the aesthetic, and the characters. (This only pertains to the Final Fantasy VII stuff from before the "Advent Children" era sequels and spinoffs.)
However, despite numerous times trying to replay the game from the beginning, I just can't. It doesn't matter if it is the PSX version or the recent PC re-release, I just can't play Final Fantasy VII for long on these subsequent playthroughs. The furthest I can get is to the point when you first leave Midgar. And that's it. For some reason, I can't play further into the game past that point.
It's like there is some mental roadblock where my mind goes, "Nope, no further. I'm fuzzled and we are stopping here." And no further can I proceed.
Which games cause this for you?