My phone line keeps dropping out

[Jholden11]

on several occasions in the last few days my phone line keeps dropping out & my broadband & WiFi goes off. 
I have spoken to Sky today & they are sending out a new Sky Q box but this does not explain why my phone line keeps dropping

[JimM1]

@Jholden11 What sky hub and service are you using!

https://www.sky.com/help/articles/broadband-diagnostic-which-sky-hub