I never had a problem upgrading my WLCs, as a matter of fact is one of the worry-free and trivial things I do at work. That changed until I tried two weeks ago to upgrade to v8.5.135.0. I do not think that the problem stated in the bug above is resolved at all. When I upgraded to v8.5.135.0 suddenly the anchor WLCs started to get sluggish and maneuvering the GUI was a total nightmare. To add insult to injury the Splash Page (UAP page) rendered in our Guests WLAN will literally take forever to render and another forever to go through once you clicked the "Accept" button, an activity that normally wouldn't even take a second. I also noticed that the CPU consumption was going through the roof obviously. So I was forced to downgrading the WLC's image to the previous one (v.8.5.120.0) and obviously as soon as I did that the WLCs behaved like always.
