NAP102 keeps switching between 2.4 and 5 GHZ

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Basch
Basch Posts: 3
First Comment
image  Freshman Member
in Wireless

Iphone keeps switching between 2 standards getting kicked by the accesspoint.

I turned off all romaing features but it still happens:

DCS client aware ON all other DCS off.
Smart Steering off
8021d band select off
assisted roamiing off
80211r off

2026-11-02 18:27:20BOVENWireless LANStation: c2:c8:c3:30:fb:67 has disassoc by iwpriv(kickmac) on Channel: 48, SSID: AM3, 5GHz, Signal: -52dBm, Tx/Rx: 8027755/1900458 Bytes. reason 5, Interface:wlan-2-2
2026-11-02 18:27:20BOVENWireless LANStation: c2:c8:c3:30:fb:67 has authorized on Channel: 1, SSID: AM3, 2.4GHz. Interface:wlan-1-2
2026-11-02 18:27:20BOVENWireless LANStation: c2:c8:c3:30:fb:67 has reassociated on Channel: 1, SSID: AM3, 2.4GHz, Signal: -61dBm. Interface:wlan-1-2
2026-11-02 18:21:59BOVENWireless LANStation: c2:c8:c3:30:fb:67 has disassoc by iwpriv(kickmac) on Channel: 1, SSID: AM3, 2.4GHz, Signal: -63dBm, Tx/Rx: 0/0 Bytes. reason 5, Interface:wlan-1-2
2026-11-02 18:21:59BOVENWireless LANStation: c2:c8:c3:30:fb:67 has authorized on Channel: 48, SSID: AM3, 5GHz. Interface:wlan-2-2
2026-11-02 18:21:59BOVENWireless LANStation: c2:c8:c3:30:fb:67 has reassociated on Channel: 48, SSID: AM3, 5GHz, Signal: -56dBm. Interface:wlan-2-2

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  • Zyxel_Judy
    Zyxel_Judy Posts: 2,841
    Zyxel Certified Network Engineer Level 2 - Nebula Zyxel Certified Network Engineer Level 2 - Switch Zyxel Certified Network Engineer Level 2 - Security Zyxel Certified Network Engineer Level 1 - Nebula
    image  Zyxel Employee
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    Hi @Basch,

    Looking at your log, the AP itself is forcing the disconnects (“disassoc by iwpriv(kickmac)”), and both kicks show reason code 5 — “AP unable to handle all currently associated stations.” That points to Load Balancing rather than roaming or signal strength (your signal levels on both bands look fine).

    Please check Configure > Access point > AP & port settings > Load Balance on Nebula? If it’s enabled with “By client device number” mode and “Disassociate client device when overloaded” turned on, enabled with “Smart Classroom”, the AP will kick clients once the client-count threshold on a radio is reached — which matches what you’re seeing. Try raising that threshold or adding the AP for your network.

    [Nebula] How to set up Load Balance on Nebula? — Zyxel Community

    Please be aware that the NAP102 model has reached its EOL status. For optimal performance and support, we recommend exploring our current AP offerings here:

    https://www.zyxel.com/us/en-us/products/wireless

    Zyxel_Judy

  • Basch
    Basch Posts: 3
    First Comment
    image  Freshman Member
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    Hi Judy,

    I was trying to solve this and focussing on roaming, thank you for pointing out that that is not what is causing it. I have load balancing disabled. There are no more than 15 devices linked to the AP (ususally 8). Channel Utilization is 10% (i've never seen it above 40%).

    Any clues on how to keep the (iphone) client on 5 Ghz?

  • Zyxel_Judy
    Zyxel_Judy Posts: 2,841
    Zyxel Certified Network Engineer Level 2 - Nebula Zyxel Certified Network Engineer Level 2 - Switch Zyxel Certified Network Engineer Level 2 - Security Zyxel Certified Network Engineer Level 1 - Nebula
    image  Zyxel Employee
    Options

    Hi @Basch,

    Because the NAP102 is end-of-life (EOL), we can only offer limited support for further investigation. To make sure your iPhone always connects to 5 GHz, you can create a new SSID, set it to 5 GHz only, and connect the iPhone to that SSID.

    Zyxel_Judy

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