FWIW, I stumbled across a way to force the flickering:
I have HOLO LAUNCHER HD installed,but, this can likely be simulated w/any aftermarket launcher.
Anyhoo,I enjoy using BLINKFEED,but,the stock SENSE desktop/drawer leave a lot to be desired,so, I created a shortcut to go directly from SENSE Desktop to the HOLO LAUNCHER HD app drawer & more often than not, the flickering started, only while in the app drawer & would continue until I exited the HOLO LAUNCHER HD app drawer. A second shortcut from SENSE Desktop to HOLO LAUNCHER HD Desktop didn't have the flickering, just the shortcut from SENSE to HOLO HD app drawer. At no other time do I have this flickering.
Just wanted to share this in hopes that it is indeed a software glitch that'll be addressed as marctronixx eluded to.