Upgrade through Version Management in Web Console times out and stops server

#1
Hi,
I have enterprise through WHM/Cpanel plugin. Current version is 5.4.12 and I can see latest release is 6.0.5. When I click on the link to Download/Upgrade it starts the process and eventually the page times out. I can't access the WebAdmin Console after that and the host sites all slowly go offline. Only way to restore is to restart the server. Have tried 3 times and need a solution that won't kill my server.
 
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