Sonos Connect on CISCO switch

Hi guys,

I wonder if someone can help me please? I have a Sonos Bridge and a couple of Play 3's all work fine. I also have a Sonos Connect that is OK but it sits next to a small CISCO 8 port managed switch. if I connect the Connect into the switch I seem to loos all connections on the switch and every light on the switch flashes. I have read up some bits and they hint towards STP (Spanning Tree Protocol) so I have enabled STP on the port that the connect is going to be connected into but is still doe the exact same thing. Any ideas on what I need to do to resolve this?

I know I don't absolutly need to plug the connect into the CAT 5 switch but it makes sense as I have the switch next to it.

Thanks