The Wi-fi connection between my iPhone 7 and HomeHub 5 is extremely poor. Issues occur regardless of location in the house, signal strength, Wi-fi channel, 5Ghz, 2.4GHz, DNS address etc. My iMac by contrast has a rock solid connection to the same router. My phone also works perfectly with a HomeHub 6 in another property.
Issues as follows:
There are no issues with signal strength and the connection does not drop. SpeedTest reports a full 50Mb connection.
However YouTube videos regularly stop playing half way through and never resume (continuous spinning circle) until I load the video again. Thumbnails often stop loading when scrolling through Instagram and websites often partially load, then stop, requiring me to refresh the page.