Network connection issues on the gigabit speed package

Hey there I'm having issues with are houses WiFi, so ever since the new hub it doesn't do it as much.

The issue is the contant disconnections, up and down speeds and it's only when we ring em up it settles again. We also have had issues where the router restarted once and forgot itself and a new ssid for the router for some reason. 

It might be the power up and down levels but it gets enough wattage and fine connection. I have checked the connections multiple times.

The issue is my mom is the WiFi holder, and she pays for it out of my money but she doesn't like the hassle of the support but for a service we pay like_70-100  for this is bad. Yes we have alot of devices but even then it should handle it in bandwidth control on the DHCP. It has happend on every hub

If a support agent sees this I'm happy to pass my mom's details or have look to send a engineer if any issues or upgrades. I am 20 but she gets the money from me for better speed because my hobby and future work is internet based as a IT network technian.

Please help