@Whtyl go into the settings on your Sky Glass TV and find the start up and standby setting and change the setting so the set stays networked in standby and also turn off network power saving. While in the settings check that the Network section is showing the WiFi connection as Good or Excellent.
The first step should improve reliability on start up. If the WiFi signal iis not good enough consider getting a WIFi extender which Sky will supply if requested if you buy their WiFi Max package,
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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
