Problem when NAS goes to sleep

Hi all,
Still enjoying Volumio. Revisiting 1.2 and it seems to be going really well. My wifi (Edimax) seems to be working fine now. No idea why, other than the pi is now in a different room in the house.
Anyway, to my problem. I am streaming over WiFi from a Windows desktop. I find that if I leave my pi switched on (as I tend to do) when not using it and my desktop goes to sleep, then it is difficult to get volumio going again. Sometimes a few mpd restarts seems to work, but more often than not, I have to reboot the pi and restart mpd. This happens even if I wake up the desktop before trying to use Volumio.

Does any one have a similar problem - better still does anyone know a way around this?

Great product!