VM Hubs are renowned for their poor Wi-Fi, and at the best of times Wi-Fi is a fickle beast that can be affected by numerous things such as distance from the Hub, building construction, other electronic devices, neighbouring Wi-Fi, basically all sorts.
VM supply to the Hub, after the Hub it is up to you.
Many on here, myself included advocate the use of a third party Gigabit capable Wi-Fi router or Mesh system.
Many thanks for your reply. Wifi on and no previous issues with wifi although we do have tp links as I have to have a wired connection for work. I turned it off over night (put it on the naughty step!) and all seems ok now.