Noise HD channels with digital sound pfl8007

[Majoney]

From Spain philips46pfl8007, with firmware 150.48.13
On a sat receiver (Canal plus) when I switch to an HD channel with Dolby Digital sound, makes a noise. No noise before this firmware.
Majorusa add this bug to your list please.

[Htep]

Yes I confirm, the sound is like a "tazer". It's very a annoying, the upgrade is worst than the past version.
Is there a way to downgrade the version?