@frankz66  When the client disconnects from the EAP, is it connecting immediately to another? I am assuming you have these setup in a mesh configuration. 

I have a somewhat similar setup but it is outdoor. One Central EAP610-Outdoor and 4 EAP225-Outdoor. I find that clients will connect to an EAP this farther away and will less signal than a much closer EAP.

I would start by testing with minimal factors, having only what is necessary to test the one EAP. Shut down all EAPs except the one. Connect and see if it stays connected. If it does not stay connected, shut it down and put one of the other EAPs in the same location. Connect and see if it stays connected. If it does then you have narrowed down to the AP itself. If it does not then the problem is elsewhere, maybe the cable that is powering it causing some anomaly or the location itself.

  @frankz66 Is the cable only for power or is it wired back to a switch? If its just for power then unlikely but should be one of the more simple things to test. You need to start with a process or elimination.  Does not matter what order, just whatever is easiest for you.  1. Swap out the AP or the cable. 1. If the problem remains, swap out whatever you did not in the first step. If the issue still remains then start looking at settings.

  @frankz66 write email to support instead of wasting time with Ricky who has no clue what he talks about, he thinks he helps you by disinformation but at the end he wastes your time.

Instead following idiotic suggestion, buy lan cable tester if you need to test oan cable, create separate ssid for each ap and test them one by one, install heat map application on your phone and measure in professional way your wireless and its coverage. Tplinks optimization is still in alpha and does not deliver optimal results. Like stated previously, contact better support as this Ricky fruit will make sure your thread gets spammed and locked.

  @frankz66 Its easy to suggest something and not realize it may not be feasible for the person to carry out due to the nature of the installation so I apologize if that is the case.

"but what I ask and if omada oc200 highlights in the "connect" status in green, can we say that if there is a problem with the cable related to the crimp or something else, it is not reported? 

I would not suspect the cable if connection status shows successful. Since you don't have a tester, and it sounds like you cannot temporarily run a new cable, I would temporarily put another AP in place of the one in question and see if the same issue is present . If the new AP does not have the same issue, you have narrowed it down to the AP itself. If the new AP has the same issue, then it either the cable, location or configuration.

  @frankz66 I am sorry to disappoint but if you believe your cable could have issue then ordering $ 10 cable tester will let you know if cable is good or not. Second option is to replace a cable which might not be broken and would cost way more if its not cheap cooper clad alu. Third option is to connect any device and see if it gets 1Gbit, then cable should be ok, if its 10Mbit, your cable has issues but here you would need again a tester.

So, to summarize it, if you deploy network you should have proper instruments and cable tester is something that you should have and be able to test existing as well as new cables.

For the rest, if it is not idiotic in your opinion like you say, then just go for it, its your time which you waste.