Just to confirm, lock/unlock commands via the SmartThings apps works from the device page. The lock is only failing to lock/unlock when the command is from an automation. Is that right?
No, the August doesn’t respond to Z-Wave at all while idle. This includes commands sent directly from the device page and automations. When you look at the log results, it looks like SmartThings tries to send the command and just doesn’t receive a response, so it times out.