Well, here is the answer:
Blizzard team currently do not have any known issue (or known bug) causing the game to crash. 
In my case I keep the system and software patches up to date. During play I do not use a third-party software, so I really doubt that the problem is on my side.
After a game crash, there is usually a pop-up window where I allow to send crash information to blizz employees. What is this pop-up window actually do? I thought that is to help blizz team to track a game error cases. But once again blizz currently do not have any known issue, so what actually this pop-up window is for?