Match loading screen then "An unexpected fatal error occurred."

Today i got “An unexpected fatal error occurred.”

1https://imgur.com/a/EaY8ltQ

I play Asia server and America server. Exactly same problem happen in both server.

I do not any computer driver update, no change firewall setting (I disabled firewall), Already I did “Scan and Repair” from battlenet launcher. Delete “%HOMEPATH%\Documents\Heroes of the Storm”, restart computer and router. But I still got same problem.

How to fix this error?

DXdiag listing might be useful to help diagnose a potential cause. Blizzard tech support should be able to review any sent crash reports as well in case a cause is obvious there.

In the mean time you might want to check if your system is completely stable. Run Furmark for GPU and Prime95 (especially AVX) for CPU. Both should be able to run for extended periods without error or system crash. If a crash does occur then there might be a fault with your hardware.

Make sure all in game overlays are disabled. Overlays such as Steam, Discord, e.t.c. are known to cause some games to have stability problems.

I don’t know what happened but problem is fixed.

Probably, my ISP or some routing system blocks UDP packets.