I have the same problem om 3 different AP's.  I changed the cables etc. Sometimes in the dashboard I see 1000 Mbps but most of the time 100 Mbps.  When I connect the Cat6 cable to my PC it is always 1000 Mbps      Maybe it's mij POE switch which is a DLInk DGS1100 8ports 1000Gbps 
						
					
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