I had the same problem with my XE9005. Constant unexpected reboots & having to unplug to get the TV to start. They told me the same as you and I reset it x'ty times, plus removed all usb items and sideloaded apps, but the problem always returned after a few weeks. I got the mainboard replaced twice under warranty and then Sony got fed up and gave me an XG9505 as a replacement.
All fine since then. I'm convinced the problem related to the processor being underpowered for the job it needed to do. All fine with the higher powered processor now.
Woah, after a few weeks!? I'm not safe yet then, I thought after a few days I was doing ok! Will report back if it happens again, also after the last load of broken TVs Sony sent me I won't be dealing with them any more, I'll use my richer sounds warranty.
I so wish I hadn't updated to oreo on my xd9005 it is nothing but a buggy mess the processor cannot cope, and as for richer sounds helping, you've got no chance, the said as it was a software issue that I would need to get in touch with sony, my tv at the moment is not fit for purpose Netflix is constantly crashing and when it's not its freezing and skipping as is the whole of the android system, I'm fuming !!!!!!
