The Samsung TV in our kitchen does this from time to time, with the SD channels 1 & 2, and we have no idea why. The HD channels 101 and 102 are unaffected.
But a retune always gets 1 & 2 back.
Have you tried retuning your Bravia?
If this does not work, then on your TV remote, press and hold the On/Standby button for just over 5 seconds until the TV reboots, and see if that fixes it.
If still no go, please let us know the model of TV for further advice.
Supporting YouView on Sony TVs is like nailing jelly to a herd of cats
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But a retune always gets 1 & 2 back.
Have you tried retuning your Bravia?
If this does not work, then on your TV remote, press and hold the On/Standby button for just over 5 seconds until the TV reboots, and see if that fixes it.
If still no go, please let us know the model of TV for further advice.