i have a dreambox 800se clone satellite receiver with tuner bcm 4505 revG
had the receiver 2 1/2 years now and all the sd channels are ok.
but some of the HD channels are starting to breakup after about 5 minutes viewing on BBC ONE HD, BBC 2 HD, ITV HD BBC THREE HD, BBC FOUR HD, ITV2 HD, ITV3 HD, ITV4 HD
the only one that dosent break up is channel 4 hd which seems strange.
i have a good signal strenth and i know it not the signal strenth,
just woundering if the tuner is starting to become faulty?

whats my option do i go for the same tuner rev G?
or can i replace it with another dreambox tuner?