@Holcop if other devices are working normally then the issue is likely to be poor WiFi signal to the TV and PS4. Streaming video and playing games not only needs sufficent bsndwidth say 25Mb/s for UHD streams but also a steady signal free from interference.
You can check the bandwidth the TV is receiving by running the network test in the Get Help menu of the Netflix app. However it sounds like you need to improve the WiFi signal in thst area of your home. First makecsure your hub is in the best position which is out in the open on a surface above obvious obstructions like radiators. After that you may need an extender which Sky will supply if you buy their add-on WiFi Max bundle and ask for one.
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65inch Sky Glass, 3 Sky Streaming Pucks, Sky Ultrafast + and Sky SR213(white Wifi Max hub) main Wifi from 3 TP-Link Deco M4 units in access point mode
