hostapd freeze

[Marek Floriańczyk]

Hi,

I have hostapd running with 80 devices connected to AP, computer is
 Linux cubieboard2 4.9.12-sunxi #4
devices are with NodeMCU module:
http://www.electrodragon.com/product/esp-12f-esp8266-wifi-board/
Hostapd is 2.6 compiled from sources.

after a while (like hour or two) hostapd freezes with strange data in log, 
there is no communication through hostapd_cli.

Some help please ;)

log included
Best Regards
Marek

hostapd.conf:
ssid=FMCode
interface=wlan2
hw_mode=g
channel=6
#bridge=br0
driver=nl80211
logger_syslog=6
logger_syslog_level=6
ctrl_interface=/var/run/hostapd
max_num_sta=500
wmm_enabled=1
#ieee80211n=1
wpa=1
preamble=1
wpa_psk=afd9ddc91baf3c0313a00b0e7e60122d50a12e423646405e9b4de963129fe107
wpa_passphrase=MarElBPE
wpa_key_mgmt=WPA-PSK
wpa_pairwise=TKIP
rsn_pairwise=CCMP
auth_algs=1
macaddr_acl=0

piece of log:

1494430529.560430: WPA: Use EAPOL-Key timeout of 1000 ms (retry counter 3)
1494430529.560501: 1494430529.560508: wlan2: STA 5c:cf:7f:ff:ec:6f WPA: EAPOL-
Key timeout
1494430529.560530: WPA: 5c:cf:7f:ff:ec:6f WPA_PTK_GROUP entering state 
REKEYNEGOTIATING
1494430529.560589: 1494430529.560596: wlan2: STA 5c:cf:7f:ff:ec:6f WPA: 
sending 1/2 msg of Group Key Handshake
1494430529.560618: WPA: Send EAPOL(version=1 secure=1 mic=1 ack=1 install=0 
pairwise=0 kde_len=32 keyidx=2 encr=1)
1494430529.560649: WPA: Replay Counter - hexdump(len=8): 00 00 00 00 00 00 00 
0b
1494430529.560689: Plaintext EAPOL-Key Key Data - hexdump(len=32): [REMOVED]
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