Hello, I'm using a 2015 Macbook 15" with the Apple USB-C to HDMI adapter (yes I have installed the firmware update on the dongle and am using the latest macOS), and when I put my MacBook to sleep, the monitor stayed powered on and will flash white every couple minutes. Very odd. Same monitor connected with the same cable to my 2013 13" MacBook Pro doesn't have this issue - the monitor sleeps as expected. Otherwise it works fine - just annoying to have to manually tun the monitor off and on when I use the MacBook. It's an Acer 21" LCD I bought a couple years ago at Best Buy. Anyone else have this issue?