WAP321 - Station had an authentication failure, reason 19/20

Clients can authenticate succesful, work for some time, until they get an authentication failure, reason 19, followed by reason 20. WLAN has to be disabled and again enabled on the client and it's working again unti it come's again to the authentication failures. What do these failures mean? And how can these be resolved?
Thanks, Roland
May 7 2013 16:22:05     info     hostapd[1086]     Station 10:40:f3:a7:7f:f6 had an authentication failure, reason 20     
May 7 2013 16:22:04     info     hostapd[1086]     Station 10:40:f3:a7:7f:f6 had an authentication failure, reason 19     
May 7 2013 15:18:09     info     hostapd[1086]     The wireless client with MAC address 10:40:f3:a7:7f:f6 has been successfully authenticated.     
May 7 2013 15:18:09     info     hostapd[1086]     wlan0: WPA STA 10:40:f3:a7:7f:f6 pairwise key exchange completed (WPAv2)     
May 7 2013 15:18:09     info     hostapd[1086]     wlan0: IEEE 802.11 STA 10:40:f3:a7:7f:f6 associated with BSSID a4:93:4c:b1:cf:08     
May 7 2013 15:18:09     info     hostapd[1086]     wlan0: IEEE 802.11 Assoc request from 10:40:f3:a7:7f:f6 BSSID a4:93:4c:b1:cf:08 SSID WLAN     
May 7 2013 15:18:09     info     hostapd[1086]     wlan0: IEEE 802.11 STA 10:40:f3:a7:7f:f6 deauthed from BSSID a4:93:4c:b1:cf:08 reason 3: STA is leaving IBSS or ESS     
May 7 2013 15:18:09     info     hostapd[1086]     wlan0: IEEE 802.11 Assoc request from 10:40:f3:a7:7f:f6 BSSID a4:93:4c:b1:cf:08 SSID WLAN     
May 7 2013 15:18:09     info     hostapd[1086]     wlan0: IEEE 802.11 STA 10:40:f3:a7:7f:f6 deauthed from BSSID a4:93:4c:b1:cf:08 reason 3: STA is leaving IBSS or ESS     
May 7 2013 14:28:47     info     hostapd[1086]     Station 10:40:f3:a7:7f:f6 had an authentication failure, reason 20     
May 7 2013 14:28:46     info     hostapd[1086]     Station 10:40:f3:a7:7f:f6 had an authentication failure, reason 19     
May 7 2013 14:03:41     info     hostapd[1086]     The wireless client with MAC address 10:40:f3:a7:7f:f6 has been successfully authenticated.     
May 7 2013 14:03:41     info     hostapd[1086]     wlan0: WPA STA 10:40:f3:a7:7f:f6 pairwise key exchange completed (WPAv2)     
May 7 2013 14:03:41     info     hostapd[1086]     wlan0: IEEE 802.11 STA 10:40:f3:a7:7f:f6 associated with BSSID a4:93:4c:b1:cf:08     
May 7 2013 14:03:41     info     hostapd[1086]     wlan0: IEEE 802.11 Assoc request from 10:40:f3:a7:7f:f6 BSSID a4:93:4c:b1:cf:08 SSID WLAN

I'm experiencing this aswell...
Jan 5 2000 06:40:44
info
hostapd[1098]
Station 1c:62:b8:ab:04:f4 had an authentication failure, reason 20
Jan 5 2000 06:40:43
info
hostapd[1098]
Station 1c:62:b8:ab:04:f4 had an authentication failure, reason 19
Jan 5 2000 06:34:53
info
hostapd[1098]
The wireless client with MAC address 1c:62:b8:ab:04:f4 has been successfully authenticated.
Jan 5 2000 06:34:53
info
hostapd[1098]
wlan0: WPA STA 1c:62:b8:ab:04:f4 pairwise key exchange completed (WPAv2)
Jan 5 2000 06:34:53
info
hostapd[1098]
wlan0: IEEE 802.11 STA 1c:62:b8:ab:04:f4 associated with BSSID d8:67:d9:c4:73:48
Jan 5 2000 06:34:53
info
hostapd[1098]
wlan0: IEEE 802.11 Assoc request from 1c:62:b8:ab:04:f4 BSSID d8:67:d9:c4:73:48 SSID World Domination Inc.
Jan 5 2000 06:34:53
info
hostapd[1098]
wlan0: IEEE 802.11 STA 1c:62:b8:ab:04:f4 deauthed from BSSID d8:67:d9:c4:73:48 reason 3: STA is leaving IBSS or ESS
Jan 5 2000 05:52:01
notice
sntp[1067]
Unable to resolve SNTP server host name:time-a.timefreq.bldrdoc.gov
Jan 5 2000 04:46:59
notice
sntp[1067]
Unable to resolve SNTP server host name:time-a.timefreq.bldrdoc.gov
Jan 5 2000 04:29:17
info
hostapd[1098]
Station 1c:62:b8:ab:04:f4 had an authentication failure, reason 20
Jan 5 2000 04:29:16
info
hostapd[1098]
Station 1c:62:b8:ab:04:f4 had an authentication failure, reason 19
The date is also set wrong on my WAP, but thats not necessarily the issue.
This problem is new as of Friday Evening (7/19/13) last week when the device was relocated.

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    Message was edited by: modular747

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