The monitor menu on the Dell Wyse 50xx keeps appearing randomly and/or the message to turn off the monitor appears and I need to tap no so the monitor does not turn off.
This is a known bug when your desktop background is a high-resolution picture. The only workaround is to remove the background picture.
From Dell...
Wyse 5040 All-in-One (AIO) Thin Client may shut down or display "Your AIO THIN Client is still on. Do you still want to power it off" when displaying high-resolution images or videos.
Affected Products:
Wyse 5040 All-in-One
This may be due to an issue with the marginal capacitor on the AIO VGA Controller Card.