I wish we were playing them slightly later in the year.
It was Oct. 20, 2018 when Purdue boat-raced OSU 49-20; we played them a week later and pushed them to the end before OSU came out of its October/early November funk against Michigan.
It was Nov. 4, 2017 when Iowa dominated the Bucks 55-24, and it came between big games against ranked division rivals Penn State and Michigan.
Heck, even in 2016, when OSU's only big loss (31-0 to Clemson) came in the playoffs, they struggled in October, beating Wisconsin in OT, losing to PSU and squeezing by Northwestern on Oct. 15, 22 and 29.
TLDR version:
Ohio State recently has experienced a dip in its seasons, but that usually doesn't come until October/November.