I had this problem too. I sent my save game to Beth at the beginning of the month. Personally, this bug was immersion-breaking for me. I don't toss that term around lightly but I just couldn't deal with having necromancers, bandits, and wolves congregating outside of Whiterun stables. In my hours of testing and attempting to fix this, the mobs were only hostile once (and they went non-hostile mid battle, walking back to their places in front of the stable), the rest of the time they just stand there. It's too weird for me.
I haven't even tried to use carriages or fast travel since I realized this was not going away- which is not a huge deal since I never fast travel anyway. I do miss my carriage rides though.

Kicenna are you saying you haven't had it happen lately even with using fast travel/carriage?