This. He may have been trying something different to compensate for poor control in one of his starts and it, has since, thrown him out of sync?
I do really like what I was hearing from Tabler, so hopefully, "his sources" have been able to get through to Stroman and will also be able to fix him mechanically. His walk rate has increased so much this season that it is likely something mechanical combined with batters staying off his low 2SM and bouncing off-speed.