Galaxy 6S video lock up after upgrade

[kzem968]

I ran the old Grand Prix version and worked great. I upgraded to v20 and now it locks up on video. I can manually start if the car is not moving but then I can't stop it. I can't start manually start or stop anymore while the car is moving even though my setting is for manual also. It almost seems like the app is bogging down my phone completely, even though I have 64GB model with 47GM free space, therefore not taking any of my taps on the screen. Is there a way to go back to the old version as I have a track weekend next weekend and I need this thing to work right?

Thank you,