Assuming it has a notification icon you would go into system settings (windows key + i), personalization > taskbar. Expand 'Other system tray icons' and toggle the application to on.
I would setup procmon to watch C:\Windows\System32\tasks that is where the scheduled tasks exist as xml files. Procmon should give you the source process
Desktop or laptop and are power conditions changing (plugged in or not)? You can have different power plans under specific conditions. Also do you have any 3rd party performance tuning utilities? Anything can programmatically alter your power settings.
You may also want to enable the TaskScheduler log with the following from an elevated powershell prompt.
$logName = 'Microsoft-Windows-TaskScheduler/Operational'
$log = Get-WinEvent -ListLog $logName
$log.IsEnabled = $true
$log.SaveChanges()
Then schedule some tasks and look at
EventViewer >...
That's not really a device per say. Stream proxy is a component of Office 365. The device "Intel High Definition DSP" is probably your audio device, so you may need to reinstall the device driver from the computer manufacturer site.
You could use procmon to determine what to add. Just filtering on PATH contains "Windows Search" and Operation is "RegSetValue" causes over 700 registry changes just toggling between classic and enhanced