hostapd deauth code 6

[Ann Lo]

Hi,

Would you provide some information on deauth code 6? A client of my AP
disconnects frequently. Using "-d" option to run hostapd, stdout is as
follow:

nl80211: BSS Event 59 (NL80211_CMD_FRAME) received for uap0
nl80211: RX frame sa=a4:2b:8c:04:6d:a8 freq=2447 ssi_signal=-38
fc=0xc0 seq_ctrl=0x8f40 stype=12 (WLAN_FC_STYPE_DEAUTH) len=26
uap0: Event RX_MGMT (19) received
uap0: mgmt::deauth
uap0: deauthentication: STA=a4:2b:8c:04:6d:a8 reason_code=6
uap0: AP-STA-DISCONNECTED a4:2b:8c:04:6d:a8

Is there a solution to the above problem? Another client has no
problem to keep its connection with my AP.

Thanks,
Ann