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Hi Trevor and welcome to JustAnswer,Thank you for the question and your patience. Should you still need assistance for information purposes only...Initially, would the same "...black shadowy spot in the centre of the screen and fades and flickers..." be evident even if just viewing just the MENU?
Turned OFF, is there anything out of the ordinary with the screen/panel?
Help me visualize please; post back with a picture showing this "...black shadowy spot in the centre of the screen..." Click HERE.
Was there a flash when the picture was taken?
This model has several automated features which may be acting or would be having a glitch every now and then. These would be Vivid Colour, Adaptive Backlight Control, Ambient sensors, Noise reduction among others (several others).
Changes in ambient light may cause reaction or in this auto-correction; another automated feature.