Displaying pending network even though there is availability

Hi,

There is new availability of system software(Walkman and Album) for my phone and I connected to WiFi and has good internet speed also but as I start downloading the updates, it always displays PENDING NEWORK and then again and again I restart the dowload from beginning . What is the cause of this problem and even though connection is good ?

Please help.

I didn't find the right solution from the Internet.

References:-
https://bit.ly/2rSdrXu
Motion graphics animation company

Thanks