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Probably a really common issue I know but I keep getting 'Disconnected - You are now offline' on a fairly regular basis and my connection will cut out for anything between 30 secs to half an hour or something like that. I've really no idea as to why it may be occuring. Any suggestions would be appreciated. I'm running Ubuntu 14.04.

I've seen these files referenced in other similar posts. I've not been able to find the solution so far:

/etc/network/interfaces:

# interfaces(5) file used by ifup(8) and ifdown(8)

auto lo

iface lo inet loopback

/etc/resolv.conf:

# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)

#     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN

nameserver 127.0.1.1

ifconfig:

eth0      Link encap:Ethernet  HWaddr f8:0f:41:eb:56:f2  

          UP BROADCAST MULTICAST  MTU:1500  Metric:1

          RX packets:0 errors:0 dropped:0 overruns:0 frame:0

          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:1000 

          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)



lo        Link encap:Local Loopback  

          inet addr:127.0.0.1  Mask:255.0.0.0

          inet6 addr: ::1/128 Scope:Host

          UP LOOPBACK RUNNING  MTU:65536  Metric:1

          RX packets:1916 errors:0 dropped:0 overruns:0 frame:0

          TX packets:1916 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:0 

          RX bytes:155737 (155.7 KB)  TX bytes:155737 (155.7 KB)



wlan0     Link encap:Ethernet  HWaddr 30:10:b3:fc:55:04  

          inet addr:192.168.0.5  Bcast:192.168.0.255  Mask:255.255.255.0

          inet6 addr: fe80::3210:b3ff:fefc:5504/64 Scope:Link

          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

          RX packets:2388 errors:0 dropped:0 overruns:0 frame:0

          TX packets:2355 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:1000 

          RX bytes:1796538 (1.7 MB)  TX bytes:418490 (418.4 KB)

And the output of lspci -knn | grep Net -A2 is:

01:00.0 Network controller [0280]: Qualcomm Atheros AR9462 Wireless Network Adapter [168c:0034] (rev 01)

    Subsystem: Lite-On Communications Inc Device [11ad:6621]

    Kernel driver in use: ath9k

Not sure how you can troubleshoot like this. Also I apologize, I am not able to comment.
Try to disable the NetworkManager and use wpa_supplicant and dhclient manually. Don't run wpa_supplicant with the -B argument to run in the background, that way you can see what it says when you disconnect.
Its going to be something like this

echo `wpa_passphrase ssid passphrase` >> /etc/wpa_supplicant.conf

wpa_supplicant -iinterface -c/etc/wpa_supplicant.conf

dhclient wlan0

Now when you disconnect look at the error it gives you. Also check the lease time when you use dhclient.