Got any Android wifi devices on the network? Try turning them off.
That is so odd, how do Android devices interfere with the cubes?
From a previous post:
It seems that there is an Android on WiFi router problem, It has to do with it ignoring the DHCP lease times.
Full information can be found on theAndroid Open Source Project Issue Tracker: DHCP client ignores lease time:
https://code.google.com/p/android/issues/detail?id=11236Insure the proxy address is either statically assigned outside the DHCP pool or set to always get the same address from DHCP, this will prevent a new proxy address stopping mining.