Aaah, SkyQ.... a box of dark magic !!
After working with this misbegotten creature for many years now, we have some tricks we have acquired :
Using the wifi access point feature if (and only if) you have Sky broadband : if you can get a network cable into a Sky mini box and your main SkyQ 2Tb or 1Tb box is similarly wired to the same network, SkyQ miniboxes make great wifi access points (repeaters). If they're not wired, as long as they are getting a very strong signal, they will bridge wifi to wifi as well. Turn wifi off on all other boxes except the one/s you want to use as repeaters (only if you have network cables attached of course , see 2 below)
If your whole SkyQ system is hardwired to the network, turn off the wifi on all boxes (except if you want to use one or 2 as repeaters), otherwise it can cause confusion on yor network if you have 2 paths to the same device (wired and wireless). On the remote, press Home, then highlight (but don't press) Settings, then type '001' then Select. Go to Network and toggle both the 2.4. and 5GHz wifi to OFF.
If you have a main cinema TV or one that is bigger and better than the other TVs in your home, make sure you put the main Sky box into that TV, as the main SkyQ box (2Tb only) is the only one that can do 4K/ UHD (strangely, since tiny devices like Amazon Firestick can accomplish this, so why not SkyQ Mini boxes too...
Be aware that unlike SkyHD, you can only have a maximum of 3 devices watching at any time, no matter how many boxes you have (see our blog on splitting a Sky Box to overcome this limitiation).
If you find sound disappears, the remote stops working, you can't access your recording or anything else unusual, pull the plug out the main box (or turn the power switch off at the socket), wait 20 seconds then plug in and wait for it to all come back. Solves 90% of all issues. Some things never change. When in doubt...pull plug out..