Have you turned off smart setup on the hub? Have you split the bands 2.4ghz and 5ghz?
You can also try to change wireless mode in additions to the suggestions of @Zombie
can you post post stats from your hub. Go to advanced settings then technical log information
enter your our phone number and post results remember delete number https://www.btwholesale.com/includes/adsl/adsl.htm
The 5ghz does cover a shorter distance but is faster and may well cover further than room router is in just need to try and see
are you able to post router stats