It's been a strange slump. If you took all the games and graded them good game, bad game and average game with no results, it would probably shake out to be 25% good game, 35% bad game and 40% average game with no results. But, there's no trending. It's not like he was having bad games and no results games and then all the rest from there were good. More so, it was bad and no results with good (single) games sprinkled in, here and there at random.
One possible theory is that those random good games were just good fortune of facing a team or pitcher who was so inferior that not even "whatever causes the slump" would get in the way of success.
But, here's the weird part - four of those good games were very high stakes for his team or him (in terms of visibility). It's almost like he willed himself into not failing on those days.
And, in his defense, some of the bad days were just uphill. I remember one HS game where he K'd in all three ABs. And, just looking at him, that's terrible. But, in that game, the opposing pitcher threw a CG 7-inning shutout where he struck out 16 batters. So, it's not he was the only one suffering that day.
But, in any event, when you add up all the games and look at the sum total of the results, the numbers say below reasonable expectations based on past performance - aka a slump.