maybe poor connection someplace? I'd encourage you to test all the plugs individually to isolate the problem. Try running audio from your computer or ipod into the same port on the R09HR, ad record one long file. Try to tease out a response if necissary, lightly jostling the cable at the R09HR end. Record for a while if you want, even if only in low quality mp3 format. Then take your interconnect cable, test that by trying output of ipod / computer into input of computer (assuming this input works perfectly). Try jostling this cable too if it isn't abundantly obvious that it's giving static. Then try out just the mics. Run the mics straight into the R09HR mic jack, crank up your levels, and record for a while, again, twisting and LIGHTLY jostling the cable to see if it's loose or problematic. Test both jacks on the 9100 in a similar fashion. You want to test all components on their own, taking care not to use say, the same interconnect with the potentially problematic input on the R09HR etc. All connections should snap in securely and none should present static when twisted lightly or mildly disturbed. If you locate a male end which seems to be to blame, try getting some Isopropyl alcohol (rubbing alcohol) and cotton balls and cleaning it off, let it dry before inserting it into anything.
These are all the simplest tests to do right off the bat, things that will take you just a short time and may be a whole lot easier (and cheaper) than replacing any component on its own. Of course, it's entirely possible that this problem has nothing to do with connections, but it sounds like it might, and these are some simple tests to try and diagnose.
Best of luck, I'm looking forward to following this thread to resolution!