Auralic Aries issue with DS Lightning

I have Auralic Aries, Roon 1.1 on my PC Windows 7 64 bit
When I have the PC switched on, I can use regularly Roon (on PC or on Ipad) and also DS Lightning
If I close Roon on PC but the PC is switched on I can use DS Lightning on ipad and iphone, but if I turn off the PC, DS Lightning no longer finds the device Auralic Aries!
it is very annoying, because sometimes I want to listen aries without turning on the PC

I suggest contacting Auralic about this–I don’t think they monitor these forums, and we are not in a position to debugging issues with Lightning DS.