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WAP121 - Randomly deauthed from BSSID reason 3: STA is leaving IBSS or ESS


i am trying to solve our huge issue. We have a lot WAP121-E-K9 V01 with firmware using for our customers as WIFI AP's hotspots and randomly every day this AP's stopped working. If I check the logs there is everytime with this case message which is in attached image about deauthed from BSSID reason 3: STA is leaving IBSS or ESS. This AP's are powered by POE from switch. There is open access (no WEP or WPA).

mtchyba v AP.JPG

If I restart AP it help for few hours or days. It happend randomly. But in our oldest AP's WAP200 which we have about 80 stocks, there is absolutely no problem and in this time is not available for sale. Do any one help me? I am trying to seek any solution, but after few days testing and searching, I have absolutely no solution. Thank you

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