O Ubuntu trava - Precisa de reinicialização

Question

Detalhes do sistema:

Histórico de instalação:

Installed 14.04 ubuntu LTS from CD and got upgraded to 16.04 LTS using software update.

Laptop is dual boot with windows7 & Ubuntu

Observação:

Interesting observation is, if Windows/Linux OS is working under high bandwidth wifi coverage, then windows/Linux continue working properly(for ever). Under low bandwidth wifi coverage Windows/Linux hang within 5 minutes.

That means, Ubuntu/Windows7 works for properly(for ever), until, until some application/browser connects to Internet thru wifi.

mohet01@mohet01-ubuntu:~$lspci -knn | grep Net 02:00.0 Network controller [0280]: Qualcomm Atheros QCA9565 / AR9565 Wireless Network Adapter [168c:0036] (rev 01) Subsystem: Dell QCA9565 / AR9565 Wireless Network Adapter [1028:020c]

Windows 7 & Ubuntu are experiencing similar hang problem.

All connected applications hang and ubuntu gets hanged. Need to hard reboot ubuntu.

Ubuntu is set to PST time where as the laptop is located in EST

Below error pattern is shown all time in /var/log/syslog

/ ********************************************** ****************************** /

Mar 11 08:01:09 mohet01-ubuntu kernel: [  320.383424] ath: phy0: Chip reset failed
Mar 11 08:01:09 mohet01-ubuntu kernel: [  320.383431] ath: phy0: Unable to reset channel, reset status -22
Mar 11 08:01:09 mohet01-ubuntu kernel: [  320.393976] ath: phy0: DMA failed to stop in 10 ms AR_CR=0xffffffff AR_DIAG_SW=0xffffffff DMADBG_7=0xffffffff
         ...........
Mar 11 08:01:12 mohet01-ubuntu NetworkManager[946]: <warn>  [1489248072.6608] device (wlan0): Activation: (wifi) association took too long, failing activation
Mar 11 08:01:12 mohet01-ubuntu NetworkManager[946]: <info>  [1489248072.6609] device (wlan0): state change: config -> failed (reason 'ssid-not-found') [50 120 53]
Mar 11 08:01:12 mohet01-ubuntu NetworkManager[946]: <info>  [1489248072.6611] manager: NetworkManager state is now DISCONNECTED
Mar 11 08:01:12 mohet01-ubuntu NetworkManager[946]: <warn>  [1489248072.6616] device (wlan0): Activation: failed for connection 'Toronto Public Library'
Mar 11 08:01:12 mohet01-ubuntu NetworkManager[946]: <info>  [1489248072.6624] device (wlan0): state change: failed -> disconnected (reason 'none') [120 30 0]
Mar 11 08:01:12 mohet01-ubuntu kernel: [  323.996216] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
Mar 11 08:01:12 mohet01-ubuntu NetworkManager[946]: <info>  [1489248072.6649] device (wlan0): supplicant interface state: scanning -> disconnected
Mar 11 08:01:12 mohet01-ubuntu wpa_supplicant[1218]: wlan0: Reject scan trigger since one is already pending
Mar 11 08:01:12 mohet01-ubuntu kernel: [  324.141569] ath: phy0: Chip reset failed
Mar 11 08:01:12 mohet01-ubuntu kernel: [  324.141575] ath: phy0: Unable to reset channel, reset status -22
Mar 11 08:01:12 mohet01-ubuntu kernel: [  324.152109] ath: phy0: DMA failed to stop in 10 ms AR_CR=0xffffffff AR_DIAG_SW=0xffffffff DMADBG_7=0xffffffff

/var/log/faillog has no information except ^@^@

Pergunta:

Tem algo a ver com o problema de hardware?

ou

É algo relacionado ao problema do driver WIFI em ambos (Linux / Windows7) que aciona esse problema?