Hi, I had an MR18 that went offline for no reason. Replacing power adapter with POE didn't help. My last attempt 2 weeks ago seemed to be the solution. Check the ethernet cable for loose wires (http://www.homedepot.com/p/Klein-Tools-VDV-LAN-Scout-Jr-Tester-VDV526-052/202520420) and push in the cable on the switch and on the MR as well. To ensure a good connection. This may not be the solution for you but you can try.
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