Your system information

• Steam client version (build number or date): build 4th of Oct 2017 blah blah
• Distribution (e.g. Ubuntu): Debian testing fully updated
• Opted into Steam client beta?: [Yes/No] No
• Have you checked for system updates?: [Yes/No] Yes

Please describe your issue in as much detail as possible:

After putting my box to sleep, then steam client does not reauthenticate (after a minute).

Steps for reproducing this issue:

1. login to steam
2. put device to sleep
3. wait an hour
4. wake up device
5. steam does not authenticate and you cannot start an online game

Workaround; exit and restart steam,

Issue is rather annoying