Co jsem dohledal, tak některé aplikace můžou způsobovat problémy se steamem.

FTP and Web Server Applications
As with P2P programs, these programs are generally very bandwidth-intensive and may generate errors in Steam. Examples include IIS services for Windows, Apache web server and MySQL servers.

Issues related to any of the programs listed below may be resolved by exiting and/or disabling the program and then exiting and restarting Steam. For certain applications, a system reboot may be required after you have shut down or disabled them.