When i connect my laptop to WiFi all other device get disconnected

When i connect my laptop to WiFi all other device get disconnected

Which WD product are you talking about?

@Lionheart13 Who is your ISP? What Modem/Router do you have? How many devices are connected at one time to your wifi and how many are allowed by your Router?

My ISP is spark nz i have no issue with this matter till before yesterday… using spark modem model no. HG659b