This issue started for many of us when Hallow’s End came around.
There is a big thread in the Technical Support Forums and a blue recently said that they “don’t think this is a bug as we can’t reproduce it on our local clients.”
I’ve recenly discovered that my family member who plays WoW who lives under the same roof and uses a laptop of a very similar setup, has pretty much the same addons, etc., does not have this issue.
Only difference we have is that I have multiple characters on several different realms which I swap between daily, as opposed to him having all of his characters on a single realm.
It all made sense after reading these posts from a couple of players - there must be a bug that’s causing looping issues when switching between realms.
A lot of posters does have SSD and even without addons (or having them disabled) and after UI reset / fresh client reinstall, the issue persists.
Really hoping that Blizz takes a good look on what’s causing this issue and fix it for us - and for those here having the same issue, please come over to Technical Support Forums and add your voice to our ongoing thread.