[Q] Automatically connected to home WiFi but no Internet (nothing works!) topic

Hi all, as noted in subject, occasionally I am connected to WiFi but I get no active connection (nothing comes in or goes out). The only way I remedy this is disabling/enabling WiFi and as this is a small annoyance, any reason this happens? I have an RT-66U router as well, if it matters.

Using a Rogers Samsung Galaxy Note 4, stock ROM, no modifications done to the device.

Thanks and happy holidays.