Hello, everyone.
If you've been experiencing the FATAL ERROR while in Dalaran / Orgrimmar / ICC / Any huge raid or capital with big population, I've got a solution for you.
Here's an app I made that you can use to prevent it from happening.

Virus Total - > HERE No idea why that one antivirus detects it as a malware, since I seriously got no intention to hurt anyone or know how to write a malware so yeah lol... :D
Simple steps:
1. Download ZIP -> HERE (Click the GREEN "WowAntiCrash.zip" text, so you don't get any viruses on)
2. Extract
3. Start the EXE
4. Find your wow.exe in install directory
5. Check the checkbox
6. Click SAVE
7. Happy playing with no crashes.

Hope I helped! :)