Not sure what the cause of this could be but it might be the case that since I modded my Wii the BBC iPlayer crashes halfway through some streams and won’t let you carry on. This is using the properietary BBC iPlayer app downloaded from the properietary Wii store.
When this happens I try rebooting the Wii and continuing but then the player then says the video stream is “not available”.
Again as I said in a previous post I have tested my wireless connection and everything is working fine.