Single beep every 14-15 minutes

I have an Asus Maximus X Hero motherboard.  I have the latest version of 
Windows 10 installed.
For the last week or so, I heard a single BIOS/motherboard beep I think 
every 14-15 minutes, though I only starting keeping track of the time 
today.  I have checked errors in the event viewer and have not found any 
errors at the specific times of the beeps.  I have 2 installed Samsung 
SSD drives, one that I never use.  I copied files to the one I do not 
use, and it seems to be find.
Any idea as to what could be causing the beeps or how I can figure it out?