Hi guys,
Sorry for the delay to answer.
Yes victorfabian, i've already updated the drivers for my laptop that i use to configure and test at work. I did the tests in two different laptop which we use to make tests constantly.
Yes capalli, i'm using 11ac AP's and 11n APs too. I'm using Windows 8.1 (I guess here is the problem) and i'm using Intel(R) Centrino(R) Advanced-N 6205 in my laptop.
No jhoward, i'm not in blacklist and we disabled the WIPS to diminish the factors involved in the issue.
Thanks in advance.