Not that mine has
it blinks when the box is getting updates.
There are a bunch of settings accessed from Xfinity=>scroll right to the gear icon=>device settings=>power preferences
time for software update check
video output (after turning on the UHD switch on the HDMI port on my LG OLED 4K set) I could select A Video Output Resolution of 16:9,2160p60 UHD (Best Resolution)