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I have an 5 year old Sony Bravia, XBR-65X810C/55X810C TV.  I connected a new Sonos Beam 2 speaker to the HDMI arc port .  Now, every time I turn on the TV, the tv ‘re-boots’ itself.  This of course takes a minute to complete, then the tv turns on, and all seems normal.  Why the re-boot?

Is there a TV firmware update?