posting for 10th time during past 2 months:
this error is a common error more in details explained in a BFA thread and also a SL thread:
BFA problem : Continuous Issue of being stuck on Loading Screens - #169 by Jingoraitin
SL problem : Continuous issue of being stuck on loading screens [NEW TOPIC] - #145 by Nazragoth-emerald-dream
PS: there is a whole mega thread in tech forum with at least +500 players reporting the same freaking problem! and NO ITS NOT ABOUT OUR UI :D!
blizzard yet ignores the thread after +500 posts, racist company.
here are the two mega threads: