Suddenly cannot connect to wifi when more than a few feet from router

[Marionfield]

Current set-up has worked for several years. Current download speed is the usual 45 Mbps. Sky multi room box wired to router won't connect. Devices more than a few feet away won't connect wirelessly. Occasionaly get 'access point temporarily full' message one one device.  

[jamesn123]

@Marionfield 

If you have Sky Q try resetting the router to factory settings then resetting all your Sky Q boxes network connection

[Marionfield · Accepted solution]

Thanks for your response. As is often the case with such issues; it all worked fine a few hours later.