Sound delayed in relation to video on DM500 clone

[ssskorpionek1]

Hello
I have a clone of DM500s
After 1 hour of watching TV on one channel sound is delayed in relation to video. I have gemini software installed but try other ones like pli, nobilosat BH ... but no changes.
Any idea why ??

[glic83]

have you fast zap enabled?if you do turn it off and see if that helps

[colusso]

i had same problem, but disabling it did not solve...