Support

Investigate Firewalls

Certain firewalls may prevent Steam from talking to its servers. You'll want to work with a specialist to ensure that the Firewall is not interfering. You may even need to temporarily disable it for testing purposes. It may be necessary to add exceptions in your firewalls for Steam if you discover that this is the cause.

Disable Overclocking

Some users overclock their hardware to gain more performance while running their system outside of manufacturer recommended settings. This can cause memory and file corruption and should be disabled (usually in the computer BIOS).

If you still have problems to use Steam continuesly, please contact the Steam Customer Support.

[Steam Support]

https://help.steampowered.com/ko/wizard/HelpWithSteamIssue/?issueid=707