Hello y'all i'm encountering same problem with unifi 30mb plan, its very slow on wifi and upon reading this thread ive tried changing all the best channels but to no avail. I'm using d-link dir-850l router with the following configuration settings currently. It takes up to 15 secs for a google page to open on my phone browser and that sucks, I have to be using vpn app to get speed connection.. is there any configuration to rectify that?