In this case, you are getting the "Flaze is still starting" error, which you can see below:
If this happens when you join a voice channel where Flaze was alone, try to make the bot leave with /leave
and then play a radio again with /play
.
If this happens when FlazeBot restarted, you may not have enabled AutoReconnect. Note that this is a Premium feature. Get to know more about this here.
/search
command.