I have over 40 (forty) Dell 3240 i5 AIO's that have had this issue for over 2+ years. Spoke with Dell Support several times. Tried many different things. All Dell updates, BIOS updates, Windows updates have been completed (no change) . They wanted me to reinstall Windows (didn't fix issue). Had no answer to the problem. Computers all work and have had no real issue as far as I could tell but sure would have like for it to have been fixed. They were under warranty when the issue started and not fixed when issue brought to Dell. Now all are out of warranty.