Latest OS / Tizen / One UI is now leaving USB ports active after going to standby

[DI6000]

Hi Guys, 
I finally caved in and allowed the upgrade to One UI and the latest Tizen on my several Samsung OLEDS ... all went OK, Except now my USB ports are staying "ON" even when the TV is off.   This is an issue because my BIAS lighting (LED light strips on back of TV) now stay on permanently.   This is wasn't an issue previously.  Does anyone know how to set the TV back so the USB ports power off when the TV is off?
Thanks

[DI6000]

Ok the issue is pixel refresh.   Even 2-3hrs of being powered off, the screen (both of them) are doing pixel refreshes, evident by the attached message when i power back on many hours later.   Have tried power cycling and starving of AC power, then doing a fresh pixel refresh request an dleaving it alone for hours ... same result. 

[DI6000]

actually no its not pixel refresh, that was due to manually seleccting it, ive since abandoned that.
It's simply leaving the USB powered after power off, I can see others have reported same.