PUN works on Windows Build and Unity Editor, but stuck on Connect to Master loading on Android Build

A days ago, I have worked on my project and everything was okay. But since yesterday the mobile build is stuck on connecting to master loading screen. I have done basic trouble shooting like restarting and checking my code, anyone can help?

I've tried these codes and it doesn't return any error messages.

void OnConnectionFail(DisconnectCause cause) {
LoadingText.text = cause.ToString();
}
void OnFailedToConnectToPhoton(DisconnectCause cause) {
LoadingText.text = cause.ToString();
}