We have some people looking into this now.
What would be a massive help, is if you all could forward us along your GameLogs folder. You can find your GameLogs folder in your Heroes of the Storm folder, usually located in My Documents. It’ll be somewhere like this C:\Users\$USERNAME\Documents\Heroes of the Storm.
UPDATE: Also, if you could attach the replay for the game as well in the email, that would also be a big help!
You can send that directly to me following the information and email address on this thread. Bug Attachment Guidelines