pipman:

I have multiple NetX extenders and PRO RF extenders these are stacked on-top of each other in each location. The reason I mention this is because I can get both unit types to lock-up or not. What I mean by that is moving the "stack" causes problems with both the PRO RF and the NetX unit at the same time. My problems are down to interference from other kit such as "hands free" telephones ironically the phones are the Philips DEC units!! not sure if this helps in your case though.