Diagnosing a Windows standby exit problem

# Show information about what took the PC out of the last standby.
powercfg -lastwake
# Or (powercfg accepts -or / for parameters)
powercfg /lastwake
# List the peripherals that can wake the PC from standby
powercfg -devicequery wake_armed
# Check whether wake-up timers are active
powercfg -waketimers
# List enabled scheduled tasks that can wake the PC from standby
Get-ScheduledTask | Where-Object { ($_.settings.waketorun) -and ($_.State -ne "Disabled") }
# Display events related to the watch
Get-WinEvent -ProviderName Microsoft-Windows-Power-Troubleshooter | Out-GridView