Start QL, about 20 30 minutes, ql crashs and in server show the message:
Failed to authenticate with steam ERR 6

Ok, many posts here and in steamcommunity about this but anyone helps me.
After steam updated, this error start with me, things that i see in other posts and try but crash continuous:

- Start QL with default cfg
- Disable steam sync with QL
- Change steam account to steam beta update participation
- Format my computer 3 times and install only windows 7 with updates, steam, QL and nvdia driver
- Delete folder "steamid" and start ql again
- Run sfc /scannow in cmd
- Change screen resolution in windows to be the same of QL
- Send email for ID explain all things that i did, but shure, no answer

2/3 months of update, 2/3 months trying to solved this.
Anyone know the fix for that?

Sorry about the poor english, i dont speak fluently :(