D800/800e: Shadow Issue on Bottom of Pix: HELP!

Hi guys!

PLEASE READ ALL: ISSUE IS NOT *THAT* OBVIOUS!

I have an issue with my D800e, which just happened on the day before the Grammy's. I shot two young performers (one Recording Academy member) for their promos... using my long lens (70-200, f 2.8) and started to have on the bottom or side (depending on orientation) a severe...

Ijen lake

When the clouds meets the steam of the hot lake you will see this beautiful scene.
If you like my post processing and would like to edit like me, feel free and join my post processing course. The link is here:
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Over the night

Last star trails from my trip last year to Mount Bromo - Indonesia
I hope to see you guys this year where I am organizing a photography workshop to this incredible place at July.