hi tplink_cpe510_ read my post here https://community.tp-link.com/en/business/forum/topic/109402?replyId=300459 I'm sure that has to be your problem simply change the POE cable for a good CAT 7 cable...

ok let me see how can I put this into words, I own two 2 wbs 210 , two wbs 510 besides many other tp links products but there is something that I noticed in the wbs units and i will like to share...