If you are having issues with Wi-Fi connectivity then it is quite possible it may be more related to channel interference, rather than a fault with the router.
For example, if a neighbour has a router that is broadcasting on the same, or similar, channel to yours then the signals can interfere, and cause your Wi-Fi range to be significantly reduced.
You could try changing the channels that your router broadcasts the Wi-Fi signal on, you can use free smartphone Apps like this to see what channels are being used within range of your smartphone, you can then change your router to use channels that are less congested.
Also, be aware that the Sagemcom router has a feature called 'Wi-Fi Optimisation', this means it can change the Wi-Fi channel itself, overriding what you have set it to, it can randomly do this after minutes, hours or days !. So if you do find a channel that works well, but then things go bad again, check to see if the router has changed channel to something different to what you set it to. If you do experience this problem then just post back here to ask the Support Team to disable the 'Wi-Fi Optimisation' on your router, once that is done it will stay on whatever channel you set it to.
If trying the above makes no difference then it may indicate an issue with the router, the Support Team here would be able to help with that when they return next week.
