安装ubuntu后发现无线网络非常不稳定，工作一段时间后就出现中断，使用 ping 发现这时显示如下：

icmp_seq=126 Destination Host Unreachable

将无线网络中断后重启则会短时间恢复正常

我使用的网卡型号

Qualcomm Atheros AR9485 Wireless Network Adapter (rev 01)

想请教原因与解决方法，恳请达人给予帮助，万分感谢！

看到其他求助贴中的信息，把一些进一步的信息提供如下：
user@user-laptop:~$ sudo lshw -numeric -class network
[sudo] password for user:
*-network
description: Wireless interface
product: AR9485 Wireless Network Adapter [168C:32]
vendor: Qualcomm Atheros [168C]
physical id: 0
bus info: pci@0000:01:00.0
logical name: wlan0
version: 01
serial: 6c:fd:b9:af:8e:26
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list rom ethernet physical wireless
configuration: broadcast=yes driver=ath9k driverversion=3.16.0-30-generic firmware=N/A ip=192.168.0.104 latency=0 link=yes multicast=yes wireless=IEEE 802.11bgn
resources: irq:16 memory:f7c00000-f7c7ffff memory:f7c80000-f7c8ffff
*-network
description: Ethernet interface
product: RTL8101E/RTL8102E PCI Express Fast Ethernet controller [10EC:8136]
vendor: Realtek Semiconductor Co., Ltd. [10EC]
physical id: 0
bus info: pci@0000:02:00.0
logical name: eth0
version: 05
serial: 00:e0:4c:7e:80:25
size: 10Mbit/s
capacity: 100Mbit/s
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress msix vpd bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=half firmware=rtl_nic/rtl8105e-1.fw latency=0 link=no multicast=yes port=MII speed=10Mbit/s
resources: irq:43 ioport:e000(size=256) memory:f0004000-f0004fff memory:f0000000-f0003fff

看到其他求助贴中的信息，把一些进一步的信息提供如下：
user@user-laptop:~$ sudo lshw -numeric -class network
[sudo] password for user:
*-network
description: Wireless interface
product: AR9485 Wireless Network Adapter [168C:32]
vendor: Qualcomm Atheros [168C]
physical id: 0
bus info: pci@0000:01:00.0
logical name: wlan0
version: 01
serial: 6c:fd:b9:af:8e:26
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list rom ethernet physical wireless
configuration: broadcast=yes driver=ath9k driverversion=3.16.0-30-generic firmware=N/A ip=192.168.0.104 latency=0 link=yes multicast=yes wireless=IEEE 802.11bgn
resources: irq:16 memory:f7c00000-f7c7ffff memory:f7c80000-f7c8ffff
*-network
description: Ethernet interface
product: RTL8101E/RTL8102E PCI Express Fast Ethernet controller [10EC:8136]
vendor: Realtek Semiconductor Co., Ltd. [10EC]
physical id: 0
bus info: pci@0000:02:00.0
logical name: eth0
version: 05
serial: 00:e0:4c:7e:80:25
size: 10Mbit/s
capacity: 100Mbit/s
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress msix vpd bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=half firmware=rtl_nic/rtl8105e-1.fw latency=0 link=no multicast=yes port=MII speed=10Mbit/s
resources: irq:43 ioport:e000(size=256) memory:f0004000-f0004fff memory:f0000000-f0003fff