I've seen several people use this strain, like you with good success on the first batch, but I have seen far fewer results on a repitch. It's definitely unusual that the yeast would underperform on its second round. Normally yeast acclimate better to beer fermentations in subsequent pitches.
I'd be curious to know more about your pitch on the most recent beer. How old was the slurry? Did you make a starter or aerate the wort? How warm did you ferment this? It may just be a finicky strain like 3724.
You may want to reach out to OYL and see what they have to say.