Hi Guys, Got a new DT25 Head and I still have the same problem of a thumping noise when I switch some of the patches on the HD500. So I contacted Line6 and sent the pod hd back to them to look at as it seems that it is the problem, they have replaced the PCB and sent it back and guess what it is no different, the guy I spoke to at Line6 said he would need to contact there department in the USA to see if they could throw any light on the issue, he said it might be a software problem. I tried rolling the flash memory back to an earlier version but it didn't do anything. Has anyone else had this problem or heard of such a problem as it seems to be a new one for Line6. I thought it was only doing this when connected with the Line6 link but I have tried it again with the 4 cable method and it still does it. But which ever method I use it doesn't do it with every patch its driving me up the wall. Can anyone HELL PLEASE.