I have Sky, the way it works is as follows...
You have a main router, and a main TV box (connected to a satellite).
The main TV box connects into your main routers WiFi, and then acts as a WiFi booster.
Any extra TV Boxes eg. ones in the bedroom, kitchen etc, these connect only over WiFi, they get all of their TV channels from the main TV Box over WiFi (even the 4K channels are streamed from the main TV box over WiFi to the other TV Boxes). All of the extra TV Boxes also work as a WiFi Booster.
So if you have sky in 3 rooms, you now have Main Router, Main TV Box, Second TV Box, Third TV Box, so 4 SSIDs being broadcast at 2.4Ghz and 4 SSIDs being broadcast at 5Ghz so 8 total being brodcast on the same SSID.
6 SSIDs likely mean just Sky in 2 rooms - totally normal for a family house.
As the TV Boxes send 4K content and HD Content, they need basically full WiFi signal to work well, so sky TV Engineers can add in extra WiFi booster boxes to ensure the WiFi signal is strong enough to carry Full HD and 4K content, bearing in mind you could be watching a 4K stream on multiple boxes... Hence you can get more SSIDs being introduced.
To answer your question 6 SSIDs is not that many for a Sky Q setup and is entirely the norm.
A fix for you is to switch to 5Ghz, and to use a channel that is not 36 (the channel used by Sky Q by default).
My Sky setup has 8 or 10 SSIDs, not sure if my main box is set to broadcast SSID or uses ethernet only.
All this being said I do not believe this is the cause of your issues.
Edited by ukhardy07 (Thu 25-Jan-18 19:13:50)