oscam / cccam observation

Hi All,
Running 0963 card in oscam / cccam ubuntu server with omnikey for a while now which seems better than when I was using cccam only.
However one slight problem is for example, when watching sports1 on 12148mhz it sometimes freezes or fails to clear. If I select the same channel on a different frequency 12110mhz it clears and runs fine. The problem seems to work in the reverse order sometimes, ie, I will have the channel in one room and not the other. The problem also seems to effect sports 4 in the same way.
Any ideas.