Tvheadend

Hi,

I'm having some problems with Oscam lately. I'm using TVHeadend with pc-nodmx method (using camd.socket). Every 2/3 channel changes oscam/tvheadend is unable to descramble and I see the following log line in oscam:

2016/02/09 20:45:21 549BABA4 c (dvbapi) Demuxer 0 stop descrambling program number 4A50 (0604@000000:4A50 unknown)

same error different channel:

2016/02/09 20:53:21 549BABA4 c (dvbapi) Demuxer 0 stop descrambling program number 4AED (0604@000000:4AED unknown)

Oscam always finds ecm, any idea how I can fix is this? Is it a common issue. How can I investigate more to fix it?

Regards