Stuck on loading screen (Leviathan)

[Varacolaci]

only reason they would suggest ISP being the issue is some net companies are known to attempt to block "ports" there are 5 that SE uses and sometime they have temp blocks or data packet loss to those ports

This is a common "technique" used by all IT services They know they have the problem but they won't admit it. They will suggest you that you have the problem but I'm sure they are aware of the problem.