WiFi often disconnecting when doing extended downloads

[konklone]

When downloading large (2GB+) amounts of data, be it small files or one big file, my WiFi will eventually drop entirely. As in, the system announces the network connection is gone, and the WiFi network is not to be found in the available list of networks. If I turn the WiFi off via the network menu, and then immediately turn it back on, it will find and reconnect to the WiFi network I was on, and I'll have connectivity again.

There's an interesting section of my dmesg output, I believe at the time leading up the disconnection, that seems relevant:

[13167.105787] cfg80211: Calling CRDA to update world regulatory domain
[13167.108157] cfg80211: World regulatory domain updated:
[13167.108160] cfg80211:  DFS Master region: unset
[13167.108161] cfg80211:   (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp), (dfs_cac_time)
[13167.108163] cfg80211:   (2402000 KHz - 2472000 KHz @ 40000 KHz), (N/A, 2000 mBm), (N/A)
[13167.108165] cfg80211:   (2457000 KHz - 2482000 KHz @ 40000 KHz), (N/A, 2000 mBm), (N/A)
[13167.108166] cfg80211:   (2474000 KHz - 2494000 KHz @ 20000 KHz), (N/A, 2000 mBm), (N/A)
[13167.108168] cfg80211:   (5170000 KHz - 5250000 KHz @ 160000 KHz), (N/A, 2000 mBm), (N/A)
[13167.108170] cfg80211:   (5250000 KHz - 5330000 KHz @ 160000 KHz), (N/A, 2000 mBm), (0 s)
[13167.108172] cfg80211:   (5490000 KHz - 5730000 KHz @ 160000 KHz), (N/A, 2000 mBm), (0 s)
[13167.108174] cfg80211:   (5735000 KHz - 5835000 KHz @ 80000 KHz), (N/A, 2000 mBm), (N/A)
[13167.108175] cfg80211:   (57240000 KHz - 63720000 KHz @ 2160000 KHz), (N/A, 0 mBm), (N/A)
[13170.768541] wlan0: authenticate with d8:50:e6:50:2a:44
[13170.771419] wlan0: send auth to d8:50:e6:50:2a:44 (try 1/3)
[13170.825525] wlan0: send auth to d8:50:e6:50:2a:44 (try 2/3)
[13170.879441] wlan0: send auth to d8:50:e6:50:2a:44 (try 3/3)
[13170.950578] wlan0: authentication with d8:50:e6:50:2a:44 timed out

I've not tested this in other environments besides my home, but it doesn't afflict my Ubuntu 14.04/14.10 Macbook Pro.