My sub account use x5 damaged on story mode too, but I decide to stop at 11-27, my main account is rage because it's actually have nothing, so I rage to 14-16 last night, and it got ban in this ban waves
Definitely sus, but this info really helps. Maybe next time, try to clear 2 to 3 easy story stages per day or two. Make sure the cp is decent enough like 1k~3k below the recommended cp per stages