Network connection stops when browsing network HDD

Here's my set-up:

Mac Mini with ML 10.8.3

Airport Extreme Router

Unpowered USB hub attached to Airport Extreme

(1) 3TB External HDD, (1) 2TB External HDD, and (1) USB Printer attached to USB hub

Disks shared over WAN

Problem: Anytime I browse my 3TB External Drive (named "NAS") over WAN and get to a certain file, connection drops from the mac completely. Also, when I try to paste a large amount of data (tried 500MB), cnnection drops as well.

Please note that I can access the drive over WAN perfectly with 100% functionality with my MacBook Pro, so it's not a HDD or router issue.

Here's the log when I browse to that "certain" file (NAS\Documents\Work\Pacsun\Data Sheets):

5/23/13 12:08:53.123 AM WindowServer[392]: CGXDisableUpdate: UI updates were forcibly disabled by application "Finder" for over 1.00 seconds. Server has re-enabled them.

5/23/13 12:09:07.123 AM WindowServer[392]: disable_update_likely_unbalanced: UI updates still disabled by application "Finder" after 15.00 seconds (server forcibly re-enabled them after 1.00 seconds). Likely an unbalanced disableUpdate call.

5/23/13 12:09:49.256 AM KernelEventAgent[42]: tid 00000000 received event(s) VQ_NOTRESP (1)

5/23/13 12:09:49.257 AM KernelEventAgent[42]: tid 00000000 type 'afpfs', mounted on '/Volumes/NAS', from '//alex@AirPort%20Extreme._afpovertcp._tcp.local/NAS', not responding

5/23/13 12:09:49.000 AM kernel[0]: ASP_TCP Disconnect: triggering reconnect by bumping reconnTrigger from curr value 0 on so 0xffffff8019166130

5/23/13 12:09:49.000 AM kernel[0]: ASP_TCP asp_tcp_usr_control: invalid kernelUseCount 0

5/23/13 12:09:49.000 AM kernel[0]: AFP_VFS afpfs_DoReconnect started /Volumes/NAS prevTrigger 0 currTrigger 1

5/23/13 12:09:49.000 AM kernel[0]: AFP_VFS afpfs_DoReconnect: doing reconnect on /Volumes/NAS

5/23/13 12:09:49.000 AM kernel[0]: AFP_VFS afpfs_DoReconnect: posting to KEA EINPROGRESS for /Volumes/NAS

5/23/13 12:09:49.000 AM kernel[0]: AFP_VFS afpfs_DoReconnect: Max reconnect time: 30 secs, Connect timeout: 15 secs for /Volumes/NAS

5/23/13 12:09:49.000 AM kernel[0]: AFP_VFS afpfs_DoReconnect: connect to the server /Volumes/NAS

5/23/13 12:09:49.000 AM kernel[0]: AFP_VFS afpfs_DoReconnect: connect on /Volumes/NAS failed 64.

5/23/13 12:09:49.000 AM kernel[0]: AFP_VFS afpfs_DoReconnect: sleep for 1 seconds and then try again

5/23/13 12:09:49.257 AM KernelEventAgent[42]: tid 00000000 found 1 filesystem(s) with problem(s)

5/23/13 12:09:50.000 AM kernel[0]: AFP_VFS afpfs_DoReconnect: connect to the server /Volumes/NAS

5/23/13 12:09:50.000 AM kernel[0]: AFP_VFS afpfs_DoReconnect: connect on /Volumes/NAS failed 64.

5/23/13 12:09:50.000 AM kernel[0]: AFP_VFS afpfs_DoReconnect: sleep for 2 seconds and then try again

5/23/13 12:09:50.732 AM com.apple.launchd[1]: (com.apple.qtkittrustedmoviesservice[1572]) Could not terminate job: 3: No such process

5/23/13 12:09:50.733 AM com.apple.launchd[1]: (com.apple.qtkittrustedmoviesservice[1572]) Using fallback option to terminate job...

5/23/13 12:09:52.000 AM kernel[0]: AFP_VFS afpfs_DoReconnect: connect to the server /Volumes/NAS

5/23/13 12:09:52.000 AM kernel[0]: AFP_VFS afpfs_DoReconnect: connect on /Volumes/NAS failed 64.

5/23/13 12:09:52.000 AM kernel[0]: AFP_VFS afpfs_DoReconnect: sleep for 4 seconds and then try again

5/23/13 12:09:56.000 AM kernel[0]: AFP_VFS afpfs_DoReconnect: connect to the server /Volumes/NAS

5/23/13 12:09:56.000 AM kernel[0]: AFP_VFS afpfs_DoReconnect: connect on /Volumes/NAS failed 64.

5/23/13 12:09:56.000 AM kernel[0]: AFP_VFS afpfs_DoReconnect: sleep for 8 seconds and then try again

5/23/13 12:10:04.000 AM kernel[0]: AFP_VFS afpfs_DoReconnect: connect to the server /Volumes/NAS

5/23/13 12:10:04.000 AM kernel[0]: AFP_VFS afpfs_DoReconnect: connect on /Volumes/NAS failed 64.

5/23/13 12:10:04.000 AM kernel[0]: AFP_VFS afpfs_DoReconnect: sleep for 10 seconds and then try again

5/23/13 12:10:14.000 AM kernel[0]: AFP_VFS afpfs_DoReconnect: connect to the server /Volumes/NAS

5/23/13 12:10:29.379 AM KernelEventAgent[42]: tid 00000000 received event(s) VQ_DEAD (32)

5/23/13 12:10:29.000 AM kernel[0]: AFP_VFS afpfs_DoReconnect: connect on /Volumes/NAS failed 60.

5/23/13 12:10:29.000 AM kernel[0]: ]

5/23/13 12:10:29.000 AM kernel[0]: AFP_VFS afpfs_DoReconnect: posting to KEA to unmount /Volumes/NAS

5/23/13 12:10:29.000 AM kernel[0]: ASP_TCP CancelOneRequest: cancelling slot 10 error 89 reqID 625 flags 0x29 afpCmd 0x3C so 0xffffff8019166130

5/23/13 12:10:29.000 AM kernel[0]: ASP_TCP CancelOneRequest: cancelling slot 11 error 89 reqID 626 flags 0x29 afpCmd 0x3C so 0xffffff8019166130

5/23/13 12:10:29.000 AM kernel[0]: ASP_TCP CancelOneRequest: cancelling slot 12 error 89 reqID 627 flags 0x29 afpCmd 0x3C so 0xffffff8019166130

5/23/13 12:10:29.000 AM kernel[0]: ASP_TCP CancelOneRequest: cancelling slot 13 error 89 reqID 628 flags 0x29 afpCmd 0x1A so 0xffffff8019166130

5/23/13 12:10:29.000 AM kernel[0]: ASP_TCP CancelOneRequest: cancelling slot 14 error 89 reqID 629 flags 0x29 afpCmd 0x11 so 0xffffff8019166130

5/23/13 12:10:29.000 AM kernel[0]: ASP_TCP Disconnect: triggering reconnect by bumping reconnTrigger from curr value 1 on so 0xffffff8019166130

5/23/13 12:10:29.000 AM kernel[0]: ASP_TCP asp_tcp_usr_control: invalid kernelUseCount 0

5/23/13 12:10:29.000 AM kernel[0]: AFP_VFS afpfs_DoReconnect started /Volumes/NAS prevTrigger 1 currTrigger 2

5/23/13 12:10:29.000 AM kernel[0]: AFP_VFS afpfs_DoReconnect: already in unmount /Volumes/NAS

5/23/13 12:10:29.380 AM KernelEventAgent[42]: tid 00000000 type 'afpfs', mounted on '/Volumes/NAS', from '//alex@AirPort%20Extreme._afpovertcp._tcp.local/NAS', dead

5/23/13 12:10:29.381 AM com.apple.launchd[1]: (com.apple.quicklook.satellite.2ED9E85B-9C48-4459-BCD1-BB36E67DD39B[1568]) Exited: Killed: 9

5/23/13 12:10:29.380 AM KernelEventAgent[42]: tid 00000000 force unmount //alex@AirPort%20Extreme._afpovertcp._tcp.local/NAS from /Volumes/NAS

5/23/13 12:10:29.381 AM KernelEventAgent[42]: tid 00000000 found 1 filesystem(s) with problem(s)

5/23/13 12:10:29.417 AM WindowServer[392]: reenable_update_for_connection: UI updates were finally reenabled by application "Finder" after 97.30 seconds (server forcibly re-enabled them after 1.00 seconds)

5/23/13 12:10:29.000 AM kernel[0]: AFP_VFS afpfs_unmount: /Volumes/NAS, flags 524288, pid 42

5/23/13 12:10:29.000 AM kernel[0]: AFP_VFS afpfs_unmount: Open Fork, Byte Range Lock, or Close Fork still in progress 1 on /Volumes/NAS

5/23/13 12:10:29.000 AM kernel[0]: AFP_VFS afpfs_unmount : afpfs_DoReconnect sent signal for unmount to proceed

5/23/13 12:10:32.000 AM kernel[0]: MacAuthEvent en1 Auth result for: 70:56:81:ce:76:17 MAC AUTH succeeded

5/23/13 12:10:32.000 AM kernel[0]: wlEvent: en1 en1 Link UP virtIf = 0

5/23/13 12:10:32.000 AM kernel[0]: AirPort: RSN handshake complete on en1

5/23/13 12:10:32.000 AM kernel[0]: wl0: Roamed or switched channel, reason #2, bssid 70:56:81:ce:76:17

5/23/13 12:10:32.000 AM kernel[0]: en1: BSSID changed to 70:56:81:ce:76:17

5/23/13 12:10:32.000 AM kernel[0]: en1::IO80211Interface::postMessage bssid changed

Any ideas on what's going on?