Samsung LE32R41BD widescreen switching

Is anyone else finding that this TV isn't switching the widescreen signal from the internal digital tuner correctly?

It switches fine from an external box (Sky or Freeview for example), and selects the right ratio when first changing channel on the internal digital tuner.

However, it doesn't switch if the internal channel changes ratio from 4:3 to 16:9, or vice versa. Tuning over the channel, and turning back corrects the it.

I have autowide selected, which as I say works fine on external boxes, just not fully on the internal DTT tuner.

 

Works fine on my 26" model.