My friend has a big screen sony bravia and it forever fails to pick up his pay tv box. I have to go and reset it for him every time so the tv can pick up the signal. I believe the sony's might have a fault. He refuses to look for software as he doesn't have internet so maybe you can look for any updates or contact sony as i'm sure yours and my friends arent the only ones playing up. Ps his sometimes is ok for a month sometimes a week or sometimes a day.
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