Hello! I am experiencing the same problem in the fifth day of the Fastlane event which gives the Nissan 180SX as prize. I have done the first 5 races from chapter 5, then I raced once on the track named "Down and Dirty" and at the end of the race, the game crashed and now it says I have a connection problem.
I mention that I have switched from Wi-Fi to Mobile Data, I have restarted my phone 3 times and I have reinstalled the game. None of these options made the problem disappear. I didn't receive a ban notification for any cheats because I didn't use any , and I have installed the game from Google Play.
Can anybody help me with this probem? Thank you very much!