I crash when playing on a server :

Crashes are fairly often related to a server-specific issue.
To make sure your crash isn’t related to a specific server, it is advised to join a vanilla Onset server.
Otherwise, if your issues persist on a vanilla server then you can scroll down into the solved solution.

My controls are not working properly :

First, you should try to reset your controls, if the problem persists then you can scroll down into the solved solution.

Solution :
- Press Windows + R to open the Executer.
- Enter: %appdata%
- Go to Appdata/local/Onset/Saved
- Delete all file inside.

You can even follow this video tutorial:
https://streamable.com/7bske