It's still "after I beat arcade mode". If I am using someone I normally don't, and it takes me a LONG time to beat arcade mode---I have normal sound all that while, until I win and get back to the title screen.
If I take Ken on easy, then I only have 5 mins of "normal sound"--after I win, sound's messed up.
It MAY be the TV, my TV model has been known to have audio issues--but AFAIK it's only ever been echoes/distotions, not "weird delays related to beating Seth". (and I've never had an issue until this week)
I wish there was a way to end the game without resetting the system. (selecting quit game will effectively reboot the system--it seems restting the signal itself is the solution--whether it's the TV or system that "interrupts" the signal)
I'm going to try just training/challenges for a while, and see how long I can go---then try arcade just to "prove" that's it.
PS----HDMI, monoprice. Blue. 6ft.