Latest update minor issue

I have a G3 77" did the update a few days ago. All went well, but sometimes, the TV will dim to 20 percent or so, and it will not come back. This is while using my PC. If I use color control. (the windows 3rd party app) and force it to 100 percent, it will come back. Otherwise, I have to restart the TV. It has happend twice now where I am looking at an almost black screen, until I use the app or turn it off.