What devices are you actually having problems with?
If you are sure that your line is good, that is, no noise when you use the quiet line test, dial 17070 option 2, there should be silence between announcements, then it's only wireless that's the problem.
Is speed good with ethernet connection IE: you get 48/51mbps when wired?
Are wireless drivers up to date? As in no newer ones available from manufacturers web site.
Wireless can be affected by many things causing interference. For example microwaves, other electrical appliances, the type and thickness of walls, interference from neighbours wifi router etc. You could try changing wireless channels in the router, channel 13 on 2.4GHz is often the least used and similarly channels 64 and above on 5GHz.
If the hub is close to other electrical devices try to move it, or them, farther apart.
There are no guarantees of wireless performance outside of test labs, no two properties, residential or otherwise have the same internal conditions affecting wireless transmissions.