Glads to see this thread is still alive.
I bought my sony A1E in December 2017, became aware of this dimming issue (by witnessing it) a few months later, and I still have the same problem today.
is plagued with this auto dimming issue. It came to a point that I play with +2 or +3 of gamma. I sent back the TV to the store twice for 'reparation' but they never could identify the issue (and I can't blame them for that because it happens very randomly). They offered to ship it back to Sony but I'm afraid it'll take forever and they will return it in the same condition. I was waiting to put a good 4-5k on the side to buy a new tv and then send my A1E to Sony and cross my fingers that they would help. I'm nearly reaching that point (and by the way, I take advice on a good 85"" (minimum) gaming tv, if you guys have any recommendations)
Put simply, Sony ****ed me. Hard. It's a ****ing $4.000 TV we're talking about here (back when I bought it). I've always been amazed by the fact that I could not ever find a proper solution to this problem, or anyone online proving to Sony that they should simply issue refunds to the owners.
Anyways, point being, **** Sony, do not buy this TV.