@Leigh12 wifi conditions can change due to interference from neighbour's networks but with extenders they need to have a good signal to operate so should be placed halfway between the hub and where you need the signal so try re-positioning the extender. It is also worth making sure any wifi source is out in the open not on the floor or under other kit and is as high in the room as practical.
For business use you may want a better solution than an extender which is never that reliable research powerline networking which uses the home's mains wiring to carry the data.
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65inch Sky Glass, 3 Sky Streaming Pucks, Sky Ultrafast + and Sky SR213(white Wifi Max hub) main Wifi from 3 TP-Link Deco M4 units in access point mode
