Working in another venue with someone else's Ion/RFR I've found that their RFR locks up a lot, there are delays in button input (press 1 @ 50 and 30 seconds later it shows up on screen), and sometimes repeated keypresses (1 becomes 111). I don't seem to have any of these issues with my RFR. What I'm wondering is- is this a problematic RFR or does this sound more like RF issues?