I have a site that is acting strange.  I have a server with a VHF(Mastr II) and UHF(TKR-850) repeater, each with a URI.  Both repeaters are linked together locally.  I noticed while someone is using the machine, the TX will just stop while they are talking.  If I switch to the other repeater, the TX is working fine.  The URIs Red LED goes out.  This happens to both machines.   I have swapped and changed URIs and cables with no change.  Any ideas?