Hello ozzy,
I do the same thing as three_easy_payments with my D2, leave it on 24/7 and it's set to 'sleep' after 15 minutes.
I use mine with a 20 TB Synology storage unit, using an iPad as the GUI, and with all 3 devices wirelessly connected to my wi-fi. I like the Lumin app with its mega data and configurable sortation options including the resolution of each track playing. It's only frozen up on me once in the almost 5 months I've been using it and this was easily rectified by just shutting the 3 units off and then back on to reset them.
My only complaint thus far is I wish the letters for alpha quick access, with the letters displayed vertically down the right side of the iPad display/remote, were a bit larger; it's hard to select accurately without using a small stylus.
Ozzy, are you using an iPad as a remote?
Tim