I've had this exact same issue for the past two versions.
I've also contacted Sega, but they've been pretty unhelpful to say the least. They even told me to forward it to to Steam support, which of course sends me right back to Sega support.
It seems no one has any idea what's causing this, yet I wonder if this issue has even been brought up to the devs.
I've seen numerous topics posted related to this bug across the web yet not one resolved case.
It's very frustrating as a customer who's purchased the game since CM01/02.
I'm willing to send any logs, specs, whatever's necessary to resolve this issue, not just for me, but for the many users who are experiencing this.