From what you say I would suspect a strong signal from a nearby source that is swamping your signals. The fact that a reboot cures it for a short while also points to this as the router if set to automatic channel selection will select the channel with the least competition. The only thing I can think of suggesting is a wifi signal booster. Fight fire with fire... let the best man win :-(
Lol, its not a strong local signal. I only have a neighbour on one side (and im detached!) and he does not have wifi ;-)
At first, i thought it might be a wifi device was causing the hub to die (ive read this elsewhere on the forums) so i turned off everything except my Galaxy S7. A couple of days later, bang, same problem.
Dont really want to fork out a bunch of cash to be a wifi router when this one should work...
If you read the original post you will notice that the faulty hub was a 2ac and he now has a 3 to replace it. In addition the 1st reply to the OP was from me who suggested.....drum roll.... rebooting the hub which automatically changes the wireless channel. Want borrow my glasses?