Hi - I have the same problem that many seem to report in that my super hub 2 is constantly loosing wifi connection to attached devices and needs to be reset. I note that iPads are reporting a security key issue and that laptops say password is incorrect (but actually is correct as it works when router is restarted). This is a daily or more frequent occurrence. From the forum posts it looks like the answer is a super hub 2ac - how do I get this?
I'm sorry to hear your hub is constantly dropping wireless connection to your devices. We'd need to test things first before replacing the hub, it could be there's a simpler fix.
I've tested the hub and everything looks good at the moment. Have you tried a factory reset of the hub yet? I'd recommend doing so if not, could you also try setting up a guest network with different security settings to see if the same thing happens?