Virgin 360 HDR signal

Hi All,

Bit of a strange one, I have a Sony TV with HDR and it looks great on Virgin 360 HDR signals, however sometimes the V360 box is sending HDR signal with non HDR content and the tv has an auto dimming function that is bypassed when a HDR signal is received. Result is a very bright non dimmed image. Noticed it when the kids are watching recordings of Pepper Pig in the morning and an annoyingly super bright image!