For what it's worth, my XBR-43X800D was having similar problems.
I had been hesistant to update my TV. The last time I updated the OS on my TV (a couple of years ago), they introduced a bug that would pop up an "Activate Samba" notification that I couldn't dismiss. After trying several things to fix the problem, I ended up doing a factory reset and turning off automatic updates. I barely used any of the TV's features anyway.
Then a few months ago, I started getting notifications every time I started up the TV to encourage me to update the TV again. Having learned my lesson, I would dismiss it and go about my business.
After a few months of playing whack-a-mole every time I turned on the TV, I accidentally hit the wrong button on the remote and the TV started its update. What a costly mistake that was.
After updating the TV, every time I turned it on with the remote it would take several minutes to boot Android. Then after awhile, it stopped responding to the remote altogether and refused to start up unless I unplugged it for a minute and plugged it in again.
Not only that, even after it finally booted up, if I had a USB stick in the USB port it would take a few more minutes to find it, at which point the TV would pop up the USB stick management screen and interrupt whatever I was watching (TV, blu-ray etc) to let me know.
I got to the point where I was ready to throw it out the window.
Then a few days ago, it just started working again. I didn't do anything on my end - I hit the remote and it turned on. I'm assuming (fingers crossed) that they finally fixed the bugs. Here's hoping it stays that way.
I gotta say Sony, I am really disappointed in how these updates have rolled out; I specifically bought a Sony because I was hoping there wouldn't be as much bloatware as a Samsung or an LG, but I'm not sure I made the right decision. I'm old enough to remember TVs that just worked, before they turned into crappy computers.
