No Wi-Fi connection with v.4.3.20 - authentification error with stopping the driver.

[Alex-n3050]

Authorization on the access point does not occur due to an error during authentication.
Its reasons are not clear to me.
It is not known what the error code 15 means. There's no decryption anywhere.
It is also unclear why the driver stopped and unloaded.

uname -a
Linux wf 4.10.0-38-generic #42~16.04.1-Ubuntu SMP Tue Oct 10 16:32:20 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

dmesg | grep RTL871X
[ 1594.757122] RTL871X: module init start
[ 1594.757123] RTL871X: rtl8812au v4.3.20_16317.20160108
[ 1595.375306] RTL871X: rtw_ndev_init(wlan0) if1 mac_addr=00:aa:68:38:df:31
[ 1595.376179] RTL871X: module init ret=0
[ 1608.590916] RTL871X: nolinked power save enter
[ 1625.507881] RTL871X: nolinked power save leave
[ 1631.583269] RTL871X: rtw_set_802_11_connect(wlan0) fw_state=0x00000008
[ 1631.830063] RTL871X: start auth
[ 1631.835906] RTL871X: auth success, start assoc
[ 1631.841558] RTL871X: rtw_cfg80211_indicate_connect(wlan0) BSS not found !!
[ 1631.841570] RTL871X: assoc success
[ 1631.863142] RTL871X: recv eapol packet
[ 1631.863324] RTL871X: send eapol packet
[ 1632.944124] RTL871X: recv eapol packet
[ 1632.944220] RTL871X: send eapol packet
[ 1634.038631] RTL871X: recv eapol packet
[ 1634.038700] RTL871X: send eapol packet
[ 1635.060050] RTL871X: recv eapol packet
[ 1635.060167] RTL871X: send eapol packet
[ 1636.080453] RTL871X: recv eapol packet
[ 1636.080577] RTL871X: send eapol packet
[ 1637.100599] RTL871X: recv eapol packet
[ 1637.100724] RTL871X: send eapol packet
[ 1638.126315] RTL871X: recv eapol packet
[ 1638.126403] RTL871X: send eapol packet
[ 1639.149843] RTL871X: recv eapol packet
[ 1639.149931] RTL871X: send eapol packet
[ 1640.161632] RTL871X: OnDeAuth(wlan0) reason=15, ta=13:fe:da:ce:13:d3, ignore=0
[ 1643.692050] RTL871X: nolinked power save enter
[ 1654.658698] RTL871X: rtw_ndev_uninit(wlan0) if1
[ 1654.714755] RTL871X: rtw_cmd_thread: DriverStopped(True) SurpriseRemoved(True) break at line 564
[ 1654.714787] RTL871X: rtw_dev_unload: driver in IPS-FWLPS