[smartBridges] help with APPO problem

[Gloria Vester]

Anyone got suggestions as to what is causing one of my APPOs to go down?  We have had to climb the water tower and reset it three times in the last week.  We replaced the POE on Wednesday and it went down again Thursday.  I ordered a new unit overnighted and replaced the unit last night.  It worked great all day today, but is down again now.  The outdoor rated cat-5 run is only about 20 feet, the cable was tested with a cable tester before putting it in place, everything is water proofed (even though we haven't had rain in months).  What else is there?  The POE was replaced, the entire unit was replaced, and we still have the same exact problem.  When it does this, the Ethernet LED is off, the Power and TXRX LED is on solid, and we have no communication with it.  Did I get so lucky as to get two bad units with the same exact problem?  The only item that has not been replaced is the power supply - could that be bad?  All the other units on the water tower are working fine since I upgraded the firmware last Sunday.  They are all plugged into the same switch, which is plugged into a UPS and all of it is in an air conditioned NEMA box.   smartBridges tech - or anyone - help! Thanks! Gloria