I had my ipad and iphone connected to my StudioLive Series III 32R using Qmix-UC and UC Surface, but after they went to sleep, they would not reconnect the next day when I turned them back on.
The only workaround I could find was to turn off Wifi on the iphone/ipad and turn it back on again, or to switch wifi networks. I am assuming that this is doing something with the IP address lease. My PC did not have the same issue.