Sorry if this is in the wrong forum, feel free to move! I have tried to look up the problem but can't seem to find a solution.

When I leave my box on a channel for more than about 20 minutes the sound/video seem to become out of sync. It only seems to be about a second out of sync but becomes quite noticeable.

Does anyone have any ideas on how to fix this? I saw something about switching off fast zapping but I can not find that anywhere on the menus :/

If it helps. Box info:

Unibox HD-1
Helios
Kernel 3.6.0
Drivers 2014-04-01
Update 201-01-4-22

Thanks so much!