Im never playing this game ever again

First of all I made my account on it and I got so many really cool stuff like bodies wheels tires the game is amazing, suddenly Im playing a game and it puts me back on home screen, I go back to see what happened and try to play network with my brother, turns out everything I had is gone and Im out of my account and I cant log in, because there is no log in button.
I tried to find something to help me relog in but theres nothing. Yes the game is super fun to play but I lost everything now I cant go back to my account and Im stuck with a brand new account that has nothing on it.
B.T.W-This isnt the first time

Fadious about LightBike 2, v2.3.17