So had Sky Q installed today, 1TB box downstairs and 1 mini in the bedroom.
Swap over was simple enough using existing cables and ethernet rather than WiFi for the connectivity of the boxes.
Basic operation was fine and all channels that should be there where available on both boxes and recordings downstairs played upstairs no problem.
However as soon as the installer left I started noticing an issue, the sound on the downstairs box would drop out for 1-3 seconds every 2-10 minutes and quickly became annoying. It happened on recordings, SD and HD channels, and with audio set to Dolby or Normal. My Q box is connected to a Sony STR-DN1050 Amp via HDMI - as the previous Sky HD box was.
Tried swapping HDMI cables, power cables, Amp inputs all to no avail. I then tried direct to HDMI on TV and Optical to Amp for sound, but decided to revert before testing properly as I thought, no I am not changing my setup, either they get it to work on this setup or I tell them to take it back and I'll return to Sky HD.
I then decided to test the upstairs box properly to discover that that box not only dropped the sound for 1-3 seconds every 2-10 minutes but also the picture.
Called Sky, who tried some reset thing which made no difference, then the got the installer to call me and I went through the issue with him, he went and called a colleague or suggested I buy a gigabit switch from netgear - when I asked how this would cause the sound to stop on the main box, he went oh actually wait a minute. I have now asked them to swap the main Q box and the installer should be coming back before 5 to do that - and have said if the issues remain to just revert and refund me.