ISP Reviews by Dragon

I have Vodafones top package using fibre installed by City Fibre.
I will start with the good: The wired speed to my PC is around 940mbps for both upload and download. That seems to be fairly reliable.
The wifi is a different story. When its up and working the speed varies from near the router at about 500mbps download / almost 600 mbps upload to furthest parts of my house almost 200mbps download / 100 to 150 mbps upload. By the way I am using their "super wifi" repeater upstairs.
However, the wifi is not reliable. It regularly drops. Some devices fail to connect entirely. The obvious resolution would be to restart the router right? Well dont expect it to come back up quickly. It will regularly take the best part of an hour to come back up. Worst was nearly 4 hours after repeated restarts and on support through their messaging app and on the phone to get it back working. The router is just not good but they have refused to replace it. I have looked into using my own router but because I have fibre and a phone plugged into the router it seems that is not an option.
I am in a contract with them for another 18 months, I will not be renewing when it comes to an end.