Hi ! my dm7020hd V1 image experimental 2016.01.05 work new dual twin sat tuner,dvb-t/c tuner!

when satellite channel ready for recording while you turn digital cable
tv-C tuner channel is no picture or stutters when recording is stopped
and switch to digital cable channel images, sat about switching C tuner
slow, dvb-t okay to start! digital kable tv signale 85% perfect !

why problem ??