ESPN/ESPN2 Audio Pops

[mjlthuston]

I had a receiver replaced the other day and since then I have had audio pops on ESPNHD, ESPN2HD, and TBSHD. The other HD channels seem to be ok. I have checked and set the Dolby Digital to off. I have reset the reciever a couple of times but no joy.
My SD recievers all work ok.
I have an HR20-700.
Does anyone have any ideas?

Thanks