How come my Wi-Fi only works for a short period of time? - 1

What I mean is it will work fine for a couple of hour but then this page shows up saying "there's a problem with your router" I'm the only one who uses the Wi-Fi for my iphone & this is bugging me. Btw this is a new router it came free when we installed our new phone line, it's connected to the house phone if that matters. Anyways, is there a way to fix this? I really don't want to go over my data. Omg it just happened as I was posting this.-.

Same thing happens to me don't use free Wi-Fi

You may have moved away from the Wi-Fi area range, the door where the Wi-Fi is located is closed preventing the signals to reach the mobile.

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