I am having this very same problem. WiiMC connects to the net/SMB fine on startup but should I not touch my Wiimote for ~60 seconds the connection is killed for some strange reason. This prevents me from watching more than one YouTube video at a time or listen to more than one SMB streamed audio file at a time without rebooting the app and simultaneously turning on/off my Macbook Pro’s AirPort (WiFi).
Those of you who have fixed this problem seem to have replaced your router or installed custom firmware. My router (a Medialink wireless-N) doesn’t support Tomato or WW-DRT so there’s little I can do there. Is this is a WiiMC bug or is this truly a router issue that I need to address by replacing it with another brand? It’s beyond annoying having to restart the app and my laptop’s WiFi every time I want to play a new file because the WiiMC loses/drops its Internet connection… 👿