[Jiaz]

I can only see network errors to 1fichier.
Readtimeout and SSL peer shut down incorrectly

I can't tell if those are caused by ISP or "Killer Control Center". But "SSL peer shut down incorrectly" sounds like Firewall/AV/Driver(KillerNetwork) issue.
In doubt you should try to downgrade driver. I know that *Killer Network Cards/Drivers* might be the cause because once there has been a driver version that had memory leak issue.