Been disconected two times while playing, my internet is fine though. Are there server problems right now? I just lost an endorsement level due to this 
There were some issues in the EU today, but I didn’t see any other issues being reported. Even if your “internet is fine,” there can be a connection problem on the route you take to reach Blizzard servers. Has the issue resolved? If not, please follow the connection troubleshooting requested by the staff and post applicable test data for people to help you.