Picture freezing with 2.3 + underworld 127

[sornin]

Hello, I just updated my cam from 2.2 to 2.3 and loaded underworld 127. It's working well with crypted channel but if I go on a FTA channel, the picture is freezing. My receiver is a KAON 570. Is it normal ? Is there a setting to avoid that ? Thank you very much for your help.

[unclehm]

Nagra?

[sornin]

All the crypted channels are OK. Only the free to air channels are freezing. That was not hapening with 2.2 and stealth.