Hello. Sorry that I'm late to the Wiim party. i've spent a couple of days with the Wiim +, with only limited expertise. When I connect the ethernet cable to the Wimm plus, the app says my signal is Weak. When I switclh to Wifi, the signal. is very good. Am I doing something wrong? The ethernet cable is new, so I assume okay. And should I use optical instead of RCA? I'm connecting to a receiver and passive speakers. Or does optical work in this situation: no tv is involved....Thank you.