An extract of dmesg output : (I have attached a complete one to the bug 623222)
[14523.473772] wlan0: authenticate with 00:18:f6:72:3e:65 (try 1)
[14523.475646] wlan0: authenticated
[14523.475669] wlan0: associate with 00:18:f6:72:3e:65 (try 1)
[14523.478298] wlan0: RX AssocResp from 00:18:f6:72:3e:65 (capab=0x411 status=0 aid=1)
[14523.478303] wlan0: associated
[15115.108393] iwlagn 0000:03:00.0: Microcode SW error detected. Restarting 0x82000000.
[15115.108418] iwlagn 0000:03:00.0: Start IWL Error Log Dump:
[15115.108425] iwlagn 0000:03:00.0: Status: 0x000213E4, count: 5
[15115.108567] iwlagn 0000:03:00.0: Desc Time data1 data2 line
[15115.108576] iwlagn 0000:03:00.0: FH_ERROR (#12) 0618680431 0x00000008 0x03130000 208
[15115.108582] iwlagn 0000:03:00.0: blink1 blink2 ilink1 ilink2
[15115.108588] iwlagn 0000:03:00.0: 0x07A10 0x004C2 0x006DE 0x07A66
[15115.108655] iwlagn 0000:03:00.0: Start IWL Event Log Dump: display last 20 entries
[15115.108682] iwlagn 0000:03:00.0: EVT_LOGT:0618649593:0x00000000:0302
[15115.108700] iwlagn 0000:03:00.0: EVT_LOGT:0618649622:0x000000d4:0303
[15115.108717] iwlagn 0000:03:00.0: EVT_LOGT:0618649626:0x0000015a:0217
[15115.108734] iwlagn 0000:03:00.0: EVT_LOGT:0618649626:0x0259001c:0217
[15115.108752] iwlagn 0000:03:00.0: EVT_LOGT:0618680049:0x00000107:0106
[15115.108769] iwlagn 0000:03:00.0: EVT_LOGT:0618680050:0x00000000:0302
[15115.108786] iwlagn 0000:03:00.0: EVT_LOGT:0618680086:0x000000d4:0321
[15115.108804] iwlagn 0000:03:00.0: EVT_LOGT:0618680088:0x00000000:1350
[15115.108821] iwlagn 0000:03:00.0: EVT_LOGT:0618680088:0x00000000:1351
[15115.108838] iwlagn 0000:03:00.0: EVT_LOGT:0618680089:0x00000000:1352
[15115.108855] iwlagn 0000:03:00.0: EVT_LOGT:0618680089:0x00000003:1353
[15115.108872] iwlagn 0000:03:00.0: EVT_LOGT:0618680097:0x00000001:0357
[15115.108890] iwlagn 0000:03:00.0: EVT_LOGT:0618680375:0x00000107:0106
[15115.108907] iwlagn 0000:03:00.0: EVT_LOGT:0618680376:0x00000000:0302
[15115.108924] iwlagn 0000:03:00.0: EVT_LOGT:0618680412:0x000000d4:0321
[15115.108941] iwlagn 0000:03:00.0: EVT_LOGT:0618680414:0x00000000:1350
[15115.108958] iwlagn 0000:03:00.0: EVT_LOGT:0618680414:0x00000000:1351
[15115.108975] iwlagn 0000:03:00.0: EVT_LOGT:0618680415:0x00000000:1352
[15115.108992] iwlagn 0000:03:00.0: EVT_LOGT:0618680415:0x00000003:1353
[15115.109009] iwlagn 0000:03:00.0: EVT_LOGT:0618680434:0x00000000:0125
[15428.664691] mac80211-phy0: failed to remove key (0, 00:18:f6:72:3e:65) from hardware (-22)
[15428.664843] wlan0: deauthenticating from 00:18:f6:72:3e:65 by local choice (reason=3)
[15428.673369] cfg80211: Calling CRDA to update world regulatory domain
[15428.678902] cfg80211: World regulatory domain updated:
[15428.678905] (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)
[15428.678908] (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[15428.678911] (2457000 KHz - 2482000 KHz @ 20000 KHz), (300 mBi, 2000 mBm)
[15428.678914] (2474000 KHz - 2494000 KHz @ 20000 KHz), (300 mBi, 2000 mBm)
[15428.678916] (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[15428.678919] (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[15431.020055] wlan0: authenticate with 00:18:f6:72:3e:65 (try 1)
[15431.021902] wlan0: authenticated
[15431.021953] wlan0: associate with 00:18:f6:72:3e:65 (try 1)
[15431.024619] wlan0: RX AssocResp from 00:18:f6:72:3e:65 (capab=0x411 status=0 aid=1)
[15431.024627] wlan0: associated