我在家里的一台笔记本电脑上安装了 Debian 9。这台笔记本电脑使用 wifi 连接到互联网。我的路由器有两个网络，一个是 2.4 GHz，一个是 5 GHz。2.4 是 G，5 是 N/AC。2.4 网络存在严重干扰，因此我尝试在大多数时间使用 5。
通常情况下，笔记本电脑可以毫无问题地连接到 N 网络。但是，每隔几天它就会断开连接，并且无法恢复。我可以看到网络并有信号，但当我尝试连接时，一段时间后就会失败。重新启动笔记本电脑没有帮助，重新启动路由器也没有帮助。最终它能够毫无问题地连接，但我不知道原因。它连接到 G 网络从来没有任何问题。
我有以下输出dmesg：
[ 57.441657] wlp4s0: associate with 10:da:43:bc:24:13 (try 1/3)
[ 57.442522] wlp4s0: RX AssocResp from 10:da:43:bc:24:13 (capab=0x1011 status=0 aid=3)
[ 57.460626] wlp4s0: associated
[ 60.253674] wlp4s0: deauthenticating from 10:da:43:bc:24:13 by local choice (Reason: 3=DEAUTH_LEAVING)
[ 60.326542] wlp4s0: authenticate with 10:da:43:bc:24:13
[ 60.329673] wlp4s0: send auth to 10:da:43:bc:24:13 (try 1/3)
[ 60.410949] wlp4s0: authenticated
[ 60.413799] wlp4s0: associate with 10:da:43:bc:24:13 (try 1/3)
[ 60.414725] wlp4s0: RX AssocResp from 10:da:43:bc:24:13 (capab=0x1011 status=0 aid=3)
[ 60.433036] wlp4s0: associated
[ 70.438856] wlp4s0: deauthenticating from 10:da:43:bc:24:13 by local choice (Reason: 3=DEAUTH_LEAVING)
[ 81.307914] wlp4s0: authenticate with 10:da:43:bc:24:13
[ 81.311042] wlp4s0: send auth to 10:da:43:bc:24:13 (try 1/3)
[ 81.402982] wlp4s0: authenticated
[ 81.405972] wlp4s0: associate with 10:da:43:bc:24:13 (try 1/3)
[ 81.406754] wlp4s0: RX AssocResp from 10:da:43:bc:24:13 (capab=0x1011 status=0 aid=3)
[ 81.424622] wlp4s0: associated
[ 85.258093] wlp4s0: deauthenticating from 10:da:43:bc:24:13 by local choice (Reason: 3=DEAUTH_LEAVING)
[ 85.307476] wlp4s0: authenticate with 10:da:43:bc:24:13
[ 85.310608] wlp4s0: send auth to 10:da:43:bc:24:13 (try 1/3)
[ 85.396766] wlp4s0: authenticated
[ 85.397924] wlp4s0: associate with 10:da:43:bc:24:13 (try 1/3)
[ 85.398815] wlp4s0: RX AssocResp from 10:da:43:bc:24:13 (capab=0x1011 status=0 aid=3)
[ 85.416923] wlp4s0: associated
[ 95.417941] wlp4s0: deauthenticating from 10:da:43:bc:24:13 by local choice (Reason: 3=DEAUTH_LEAVING)
[ 106.506127] wlp4s0: authenticate with 10:da:43:bc:24:13
[ 106.510613] wlp4s0: send auth to 10:da:43:bc:24:13 (try 1/3)
[ 106.593598] wlp4s0: authenticated
[ 106.594489] wlp4s0: associate with 10:da:43:bc:24:13 (try 1/3)
[ 106.595251] wlp4s0: RX AssocResp from 10:da:43:bc:24:13 (capab=0x1011 status=0 aid=3)
[ 106.613155] wlp4s0: associated
[ 108.332268] wlp4s0: deauthenticating from 10:da:43:bc:24:13 by local choice (Reason: 3=DEAUTH_LEAVING)
查看系统日志，我看到了以下内容：
Jan 22 06:52:10 debian-tv wpa_supplicant[570]: wlp4s0: CTRL-EVENT-SSID-REENABLED id=0 ssid="my_wifi_network"
Jan 22 06:52:10 debian-tv wpa_supplicant[570]: wlp4s0: SME: Trying to authenticate with 10:da:43:bc:24:13 (SSID='my_wifi_network' freq=5560 MHz)
Jan 22 06:52:10 debian-tv kernel: [213853.432382] wlp4s0: authenticate with 10:da:43:bc:24:13
Jan 22 06:52:10 debian-tv kernel: [213853.434847] wlp4s0: send auth to 10:da:43:bc:24:13 (try 1/3)
Jan 22 06:52:10 debian-tv NetworkManager[446]: <info> [1516621930.1687] device (wlp4s0): supplicant interface state: scanning -> authenticating
Jan 22 06:52:10 debian-tv wpa_supplicant[570]: wlp4s0: Trying to associate with 10:da:43:bc:24:13 (SSID='my_wifi_network' freq=5560 MHz)
Jan 22 06:52:10 debian-tv kernel: [213853.488669] wlp4s0: authenticated
Jan 22 06:52:10 debian-tv kernel: [213853.492272] wlp4s0: associate with 10:da:43:bc:24:13 (try 1/3)
Jan 22 06:52:10 debian-tv kernel: [213853.493062] wlp4s0: RX AssocResp from 10:da:43:bc:24:13 (capab=0x1011 status=0 aid=3)
Jan 22 06:52:10 debian-tv NetworkManager[446]: <info> [1516621930.2293] device (wlp4s0): supplicant interface state: authenticating -> associating
Jan 22 06:52:10 debian-tv wpa_supplicant[570]: wlp4s0: Associated with 10:da:43:bc:24:13
Jan 22 06:52:10 debian-tv kernel: [213853.510954] wlp4s0: associated
Jan 22 06:52:10 debian-tv NetworkManager[446]: <info> [1516621930.2500] device (wlp4s0): supplicant interface state: associating -> associated
Jan 22 06:52:14 debian-tv NetworkManager[446]: <warn> [1516621934.3489] device (wlp4s0): Activation: (wifi) association took too long
Jan 22 06:52:14 debian-tv NetworkManager[446]: <info> [1516621934.3490] device (wlp4s0): state change: config -> need-auth (reason 'none') [50 60 0]
Jan 22 06:52:14 debian-tv kernel: [213857.618638] wlp4s0: deauthenticating from 10:da:43:bc:24:13 by local choice (Reason: 3=DEAUTH_LEAVING)
Jan 22 06:52:14 debian-tv NetworkManager[446]: <warn> [1516621934.3545] device (wlp4s0): Activation: (wifi) asking for new secrets
Jan 22 06:52:14 debian-tv wpa_supplicant[570]: wlp4s0: CTRL-EVENT-DISCONNECTED bssid=10:da:43:bc:24:13 reason=3 locally_generated=1
Jan 22 06:52:14 debian-tv wpa_supplicant[570]: wlp4s0: CTRL-EVENT-REGDOM-CHANGE init=CORE type=WORLD
Jan 22 06:52:14 debian-tv NetworkManager[446]: <warn> [1516621934.3843] sup-iface[0x562c700c6830,wlp4s0]: connection disconnected (reason -3)
Jan 22 06:52:14 debian-tv NetworkManager[446]: <info> [1516621934.3844] device (wlp4s0): supplicant interface state: associated -> disconnected
Jan 22 06:52:14 debian-tv NetworkManager[446]: <info> [1516621934.3895] device (wlp4s0): state change: need-auth -> prepare (reason 'none') [60 40 0]
Jan 22 06:52:14 debian-tv NetworkManager[446]: <info> [1516621934.4103] device (wlp4s0): state change: prepare -> config (reason 'none') [40 50 0]
Jan 22 06:52:14 debian-tv NetworkManager[446]: <info> [1516621934.4106] device (wlp4s0): Activation: (wifi) connection 'my_wifi_network' has security, and secrets exist. No new secrets needed.
Jan 22 06:52:14 debian-tv NetworkManager[446]: <info> [1516621934.4106] Config: added 'ssid' value 'my_wifi_network'
Jan 22 06:52:14 debian-tv NetworkManager[446]: <info> [1516621934.4106] Config: added 'scan_ssid' value '1'
Jan 22 06:52:14 debian-tv NetworkManager[446]: <info> [1516621934.4107] Config: added 'key_mgmt' value 'WPA-PSK'
Jan 22 06:52:14 debian-tv NetworkManager[446]: <info> [1516621934.4107] Config: added 'auth_alg' value 'OPEN'
Jan 22 06:52:14 debian-tv NetworkManager[446]: <info> [1516621934.4107] Config: added 'psk' value '<hidden>'
Jan 22 06:52:14 debian-tv wpa_supplicant[570]: wlp4s0: SME: Trying to authenticate with 10:da:43:bc:24:13 (SSID='my_wifi_network' freq=5560 MHz)
Jan 22 06:52:14 debian-tv kernel: [213857.697118] wlp4s0: authenticate with 10:da:43:bc:24:13
Jan 22 06:52:14 debian-tv NetworkManager[446]: <info> [1516621934.4337] device (wlp4s0): supplicant interface state: disconnected -> authenticating
Jan 22 06:52:14 debian-tv kernel: [213857.700842] wlp4s0: send auth to 10:da:43:bc:24:13 (try 1/3)
Jan 22 06:52:14 debian-tv wpa_supplicant[570]: wlp4s0: Trying to associate with 10:da:43:bc:24:13 (SSID='my_wifi_network' freq=5560 MHz)
Jan 22 06:52:14 debian-tv kernel: [213857.789529] wlp4s0: authenticated
Jan 22 06:52:14 debian-tv kernel: [213857.792103] wlp4s0: associate with 10:da:43:bc:24:13 (try 1/3)
Jan 22 06:52:14 debian-tv kernel: [213857.793018] wlp4s0: RX AssocResp from 10:da:43:bc:24:13 (capab=0x1011 status=0 aid=3)
Jan 22 06:52:14 debian-tv NetworkManager[446]: <info> [1516621934.5275] device (wlp4s0): supplicant interface state: authenticating -> associating
Jan 22 06:52:14 debian-tv wpa_supplicant[570]: wlp4s0: Associated with 10:da:43:bc:24:13
Jan 22 06:52:14 debian-tv kernel: [213857.812804] wlp4s0: associated
Jan 22 06:52:14 debian-tv NetworkManager[446]: <info> [1516621934.5508] device (wlp4s0): supplicant interface state: associating -> associated
Jan 22 06:52:24 debian-tv wpa_supplicant[570]: wlp4s0: Authentication with 10:da:43:bc:24:13 timed out.
Jan 22 06:52:24 debian-tv kernel: [213867.814182] wlp4s0: deauthenticating from 10:da:43:bc:24:13 by local choice (Reason: 3=DEAUTH_LEAVING)
Jan 22 06:52:24 debian-tv wpa_supplicant[570]: wlp4s0: CTRL-EVENT-DISCONNECTED bssid=10:da:43:bc:24:13 reason=3 locally_generated=1
Jan 22 06:52:24 debian-tv wpa_supplicant[570]: wlp4s0: CTRL-EVENT-SSID-TEMP-DISABLED id=0 ssid="my_wifi_network" auth_failures=1 duration=10 reason=CONN_FAILED
所以看起来它无法验证身份，但我不确定为什么。有人能帮我吗？如果您需要更多信息，请告诉我，我可以得到它。
我正在运行 Debian 9 稳定版，并拥有最新的软件包以及我的 wifi 卡的非免费固件。