[CLIENT] Stuck on "logging on" (only occurs in the afternoon/evening, subsequently for a few days)

Lately, it has been brought to my attention that in the afternoon and evening, I am always getting stuck at the logging screen (I have also tested various periods everyday, with a 100% reproduction rate when trying to log on in the said time) I am aware that these types of issues can be caused by the individual's connection, but do note that I have also tried solving this through the support page (Simple things first, such as proper region, then making sure Internet explorer is not running in offline mode, also that the internet time is synchronized, etc.) On one hand, I can play just fine throughout the morning , but then I cannot even log on. After a rather long period of time, a pop-up says: "An unknown error has occurred." This has been going on for a few days now.