Need assistance on what's going on with this issues. I've been playing this game Diablo 3 from Act 1 to Act 4 and I don't have any issues of disconnecting or crashing issues. But, after I started playing the expansion Act 5 reaper of souls, it all starts crashing multiple times. It's annoying that you have to start where you at and didn't save the last time where my character at.
Always Crashes on Act 5
Could you try updating your AMD video drivers to the Crimson ReLive Edition 17.7.1 release and then see if the issue remains?
http://support.amd.com/en-us/download/desktop/previous/detail?os=Windows%2010%20-%2064&rev=17.7.1