I have just joined this forum today to add my interest in this issue. Since updating to 6.0.1. v 6.1004. I too am having the TV randomly reboot itself for no reason that I can see. I have a model kdl-75w855c and before the update, I didn't have this issue. Now, its always less than 48hrs and I get a random reboot. Sometimes, I can be playing a game on my PC (connected via HDMI), suddenly the screen freezes, sound goes off, then a reboot occurs. Sometimes I could be watching a film via my serviio server (connected via lan wire conector - RJ45), again, screen freezes, sound goes off, TV reboots. 
Some of my films no longer stream properly either - very juddery, when before they worked fine. I've had to re-compress some of my films in a different format to get them to work again - very frustrating.
Before the update, I never had any of these issues. I was hoping to get some extra features in the 'Video' dlna menu system, i.e. menu wrapping, so when you get to the bottom of a list, it auto-wraps to the top of the list, instead of having to go all the way back up, or the addition of a media pixel size in the 'Information' option (i.e. 1920 x 1080) - more useful than knowing how big a file is.
Anyway, none of the things I wanted appeared, and all I did was give myself a load of problems on the TV which I didn't have before ....... Now I've got to hope they bring out a future update and hope it doesn't make things even worse ...... I'd be tempted to leave things as they are, but when gaming, to loose your screen in mid-battle is no good at all, so I'm going to be forced to try the next update (if they do one) .......... 
I appreciate the reply Jeff, but I'm not sure how this assists me ?
The computer is plugged in via an HDMI socket - nothing to do with network. If I unplug the network cable from the TV with no other network device attached (I don't use wi-fi), no USB devices attached (I don't have anything attached that way anyway) no Bluetooth devices attched (Don't have any of these either - and No, I don't even own a mobile phone or any other mobile device because being too near to wireless signals makes me ill. I even have to give a wide berth to microwave ovens I'm that bad with them), and I just play on my computer (via the HDMI) - the TV still reboots usually once a day, but no more than 48hrs before it does.
Now, granted the computer is plugged into the network, but thats not the TV, so the TV has nothing network attached and its still happening. I only mentioned my Serviio server because thats yet another time when the TV has rebooted, but it does it no matter what I'm doing - watching set-top box, playing a bluray disk, playing computer ........ it happens regardless, when it didn't happen before the update (perhaps once in a blue moon) ..... whilst I'm open to suggestion, I still have to put this issue down to the update as the TV wasn't like this before the update.
The juddering I mentioned is down to anything I compressed using the .m4v extension streaming via my serviio server. I've changed many of my films which I compressed in that format to matroska .mkv format, and they play ok, yet before the update, both formats played fine, so I'm unsure how the same film coming from the same server in 2 different formats, one plays fine, the other judders like mad - yet this only starts happening when the TV has a firmware / software update ?
Again, if you can think of anything I might have missed, I'd appreciate any assistance. I haven't bothered contacting Sony as from many of the replies on the forum about issues since the update, Sony have been far from helpful in solving, well as far as I can tell, ANYONE's issue as of yet ......... there has only been talk of a couple of 'workarounds'. My TV is less than 6 months old and ....... 'Workarounds' ?? ...... doesn't sound good for those of us looking for a permanent solution, and none of the workarounds address my personal issues. As I say, I have to hope that Sony decides to release yet another update and I'll be forced to try it, hoping it doesn't make matters worse. 
Maybe they'll release a downgrade option - I wish I'd never downloaded this update. 
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