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WAP351 Authentication failure reason 19 20

Hello. We have bought several WAP351 access points and have some problems connecting with a MAC. In the log of the AP I see the following

Feb 4,2016 14:35:48 info hostapd[1583] Station aa:bb:cc:dd:ee:ff had an authentication failure, reason 20
Feb 4,2016 14:35:47 info hostapd[1583] Station aa:bb:cc:dd:ee:ff had an authentication failure, reason 19
Feb 4,2016 14:30:47 info hostapd[1583] The wireless client with MAC address aa:bb:cc:dd:ee:ff has been successfully authenticated.
Feb 4,2016 14:30:47 info hostapd[1583] STA aa:bb:cc:dd:ee:ff pairwise key exchange completed (WPAv2)
Feb 4,2016 14:30:46 info hostapd[1583] STA aa:bb:cc:dd:ee:ff associated with BSSID 11:22:33:44:55:66
Feb 4,2016 14:30:46 info hostapd[1583] Assoc request from aa:bb:cc:dd:ee:ff BSSID 11:22:33:44:55:66 SSID <COMPANY>
Feb 4,2016 14:30:33 debug hostapd[1583] station: aa:bb:cc:dd:ee:ff deauthenticated
Feb 4,2016 14:30:33 info hostapd[1583] STA aa:bb:cc:dd:ee:ff deauthed from BSSID 11:22:33:44:55:66 reason 4: Disassociated due to inactivity
Feb 4,2016 14:29:33 info hostapd[1583] The wireless client with MAC address aa:bb:cc:dd:ee:ff has been successfully authenticated.
Feb 4,2016 14:29:33 info hostapd[1583] STA aa:bb:cc:dd:ee:ff pairwise key exchange completed (WPAv2)
Feb 4,2016 14:29:30 info hostapd[1583] STA aa:bb:cc:dd:ee:ff associated with BSSID 11:22:33:44:55:66
Feb 4,2016 14:29:30 info hostapd[1583] Assoc request from aa:bb:cc:dd:ee:ff BSSID 11:22:33:44:55:66 SSID <COMPANY>
Feb 4,2016 14:28:58 info hostapd[1583] STA aa:bb:cc:dd:ee:ff deauthenticated for reason 16: Group key handshake timeout
Feb 4,2016 14:28:58 info hostapd[1583] Station aa:bb:cc:dd:ee:ff had an authentication failure, reason 17

Where

aa:bb:cc:dd:ee:ff MAC address of station (Mac laptop)

11:22:33:44:55:66 MAC address of AP

I read here http://www.aboutcher.co.uk/2012/07/linux-wifi-deauthenticated-reason-codes/ that the reason codes mean:

19 Invalid pairwise cipher
20 Invalid AKMP

But I am using the correct password, so I am wondering what it actually causing this.

I am wondering what I can do or how to troubleshoot further. The firmware is the latest, 1.0.1.4. Thank you

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