I will try your solution LunarRequiem and get back to you. There seems to be a problem with battlenet updates.
Since May 10, I get the repeating situation:
Step 1: Almost new day (first game of the day), the game crashes after 5 minutes.
Step 2 : I reinstall the battle.net app and I can play during the day without crashes.
Step 3 : The next day (first game of the day), the game crashes after 5 minutes.
Step 4 : repeat step 2…