I have the 4K Octagon plugged into a HDMI input on a SONY STR-DH750 RECEIVER and that plugged into the HDMI Input on the LG 4K OLED TV. When the SOUND volume is adjusted on the SONY amp, the TV picture blanks for about 5 secs then the sound mutes for another 2 secs and then both picture and sound return to normal. Touch the volume control again, the problem repeats. This only happens with the Octagon Receiver. I have Blue Ray player and a Vu+Solo2 connected to inputs on the amp and there is no problem with picture and sound loss. Octagon and Vu+Solo2 have OpenVix images and the settings in the HDMI CEC are the same. Both off. Have tried all the settings in the SONY amp HDMI settings to no avail. I don't have enough HDMI inputs on the TV to configure devices that alternative method. Can any one solve this annoying problem.