Hi, my game just crashes randomly. Happened 3x till now

Check that your antivirus and firewall have Voobly in their list of excepted programs.

If this step no longer works for you, you should call your internet provider to see what is happening. Remember to have your IPv4 handy before calling.

Are you getting any error messages?
Does Voobly crash as well, or does the lobby window close?
Has it been working in the past, or are those crashing issues a new problem you are experiencing lately?

I'm experiencing the same myself. For me the lobby either disconnects or voobly closes completely which disconnects me during a game.

That's a problem with your internet connection. Your IP either keeps changing or you have an issue with your network devices, such as your WiFi or your switch / network cables.