Are you sure it's simply, noone is in the channel? Soul is currently running the Clan_Gaia bot on his laptop and I'm sure he doesn't have it on 24/7. Warcraft 3 clan channels are always restricted to non members if the channel is empty, so a member would have to be in the channel to actually make it "active" in order for non clan members to join the channel.
Solutions?
• Join the clan on your account so you can avoid that problem.
• Type /who clan gaia to see if anyone is in the channel.
The only time clan channels are actually restricted with clan members still in it is when the chieftain issues the command to lock down the channel, but I doubt Soul would do that.