My original modem from few years ago has some problems with ethernet ports so I called Maxis and they replace the modem with a new one for free.

However, with the new modem, I often get disconnected from the WiFi and I realize there is an extra SSID of my WiFi. For example my SSID is "HomeWifi", sometimes there is one extra network named "HomeWifi 2".

How is this possible and why? Is there a way to disable it?