Hostapd `EAPOL TX: no buffer space available' error

Hi guys, I have just configured hostapd with NAT to let my smart phone use wired network. At first, it worked normally. But recently I found that sometimes, the connection between the AP and my phone seemed to fail after some time, especially when there are some other devices connecting my AP. Here 'fail' means no packets can be transfered between the two devices and any new device cannot establish a connection with the AP. It seems that at that time, my wireless device only broadcast an SSID, and when I look at the terminal, there are nothing uncommon except some `nl80211: EAPOL TX: no buffer space available' errors. When I tried to let my AP work again, I found that seemingly any actions, except restarting my laptop, does not work. I tried googling, but no luck.
My /etc/hostapd/hostapd.conf file:
interface=wlan0
bridge=br0
driver=nl80211
logger_syslog=-1
logger_syslog_level=2
logger_stdout=-1
logger_stdout_level=2
dump_file=/tmp/hostapd.dump
ctrl_interface=/var/run/hostapd
ctrl_interface_group=0
ssid=[ssid]
hw_mode=g
channel=7
beacon_int=100
dtim_period=2
max_num_sta=5
rts_threshold=2347
fragm_threshold=2346
macaddr_acl=0
auth_algs=3
ignore_broadcast_ssid=0
wmm_enabled=1
wmm_ac_bk_cwmin=4
wmm_ac_bk_cwmax=10
wmm_ac_bk_aifs=7
wmm_ac_bk_txop_limit=0
wmm_ac_bk_acm=0
wmm_ac_be_aifs=3
wmm_ac_be_cwmin=4
wmm_ac_be_cwmax=10
wmm_ac_be_txop_limit=0
wmm_ac_be_acm=0
wmm_ac_vi_aifs=2
wmm_ac_vi_cwmin=3
wmm_ac_vi_cwmax=4
wmm_ac_vi_txop_limit=94
wmm_ac_vi_acm=0
wmm_ac_vo_aifs=2
wmm_ac_vo_cwmin=2
wmm_ac_vo_cwmax=3
wmm_ac_vo_txop_limit=47
wmm_ac_vo_acm=0
eapol_key_index_workaround=0
eap_server=0
own_ip_addr=127.0.0.1
wpa=2
wpa_passphrase=[secret phrase]
wpa_key_mgmt=WPA-PSK
rsn_pairwise=CCMP
wpa_ptk_rekey=600
Please help me. At least let me know meaning and cause of the error message.

Bonjour,
Toutd'abord merci de votre réponse!
A première vu mes fichiers sont bien fermé après écriture, faudrait que je fasse un étude plus approfondie pour en être sûre à 100% mais si le problème viendrait de là je pense que mon erreur arriverait plus souvent que toute les 1 à deux semaine, en effet ma base de donnée tourne en permanence 24/24 7/7 en service sur windows pour recevoir les données provenant du moteur (les données sont stocké dans un mémoire cyclique dans la base de donnée). Je vais consulter plusieur fois mes données par jours en me connectant à ma base de donnée avec mon programme et ensuite je me deconnecte de la base de donnée quand j'ai vu ce que je voulais voir! Et ce plusieur fois par jour!! Mais certaine fois (toute les 1 à 2 semaines) je ne peux plus me connceter à cette base de donnée car j'ai cette erreur 10055 qui apparait, je dois donc redémarrer la base de donnée et le problème est résolu pour un certain temps à nouveau!
Cordialement
Sébastien Kuenlin

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