Comment 11 for bug 850544

Best I can do is assume this is an issue with the kernel driver; though I can't reproduce it (with the same driver, not the same device):

Sep 14 20:28:26 vipul-Rev-1-0 NetworkManager[1422]: <info> (wlan0): device state change: activated -> unavailable (reason 'none') [100 20 0]
Sep 14 20:28:26 vipul-Rev-1-0 NetworkManager[1422]: <info> (wlan0): deactivating device (reason: 0).
Sep 14 20:28:26 vipul-Rev-1-0 kernel: [ 234.534621] iwlagn 0000:03:00.0: RF_KILL bit toggled to disable radio.
Sep 14 20:28:26 vipul-Rev-1-0 kernel: [ 234.536265] iwlagn 0000:03:00.0: Not sending command - RF KILL
Sep 14 20:28:26 vipul-Rev-1-0 kernel: [ 234.536280] iwlagn 0000:03:00.0: Error sending REPLY_TX_LINK_QUALITY_CMD: enqueue_hcmd failed: -5
Sep 14 20:28:26 vipul-Rev-1-0 kernel: [ 234.536295] iwlagn 0000:03:00.0: Not sending command - RF KILL
Sep 14 20:28:26 vipul-Rev-1-0 kernel: [ 234.536305] iwlagn 0000:03:00.0: Error sending REPLY_ADD_STA: enqueue_hcmd failed: -5
Sep 14 20:28:26 vipul-Rev-1-0 kernel: [ 234.536313] HW problem - can not stop rx aggregation for tid 0
Sep 14 20:28:26 vipul-Rev-1-0 kernel: [ 234.536349] iwlagn 0000:03:00.0: Not sending command - RF KILL
Sep 14 20:28:26 vipul-Rev-1-0 kernel: [ 234.536358] iwlagn 0000:03:00.0: Error sending REPLY_ADD_STA: enqueue_hcmd failed: -5
Sep 14 20:28:26 vipul-Rev-1-0 kernel: [ 234.536366] HW problem - can not stop rx aggregation for tid 1
Sep 14 20:28:26 vipul-Rev-1-0 kernel: [ 234.536392] iwlagn 0000:03:00.0: Not sending command - RF KILL
Sep 14 20:28:26 vipul-Rev-1-0 kernel: [ 234.536400] iwlagn 0000:03:00.0: Error sending REPLY_QOS_PARAM: enqueue_hcmd failed: -5
Sep 14 20:28:26 vipul-Rev-1-0 kernel: [ 234.536409] iwlagn 0000:03:00.0: Failed to update QoS
Sep 14 20:28:26 vipul-Rev-1-0 kernel: [ 234.536421] iwlagn 0000:03:00.0: Not sending command - RF KILL
Sep 14 20:28:26 vipul-Rev-1-0 kernel: [ 234.536429] iwlagn 0000:03:00.0: Error sending REPLY_RXON: enqueue_hcmd failed: -5
Sep 14 20:28:26 vipul-Rev-1-0 kernel: [ 234.536438] iwlagn 0000:03:00.0: Error clearing ASSOC_MSK on BSS (-5)
Sep 14 20:28:26 vipul-Rev-1-0 kernel: [ 234.536658] iwlagn 0000:03:00.0: Not sending command - RF KILL
Sep 14 20:28:26 vipul-Rev-1-0 kernel: [ 234.536667] iwlagn 0000:03:00.0: Error sending REPLY_RXON: enqueue_hcmd failed: -5
Sep 14 20:28:26 vipul-Rev-1-0 kernel: [ 234.536675] iwlagn 0000:03:00.0: Error clearing ASSOC_MSK on BSS (-5)
Sep 14 20:28:26 vipul-Rev-1-0 kernel: [ 234.536685] iwlagn 0000:03:00.0: Not sending command - RF KILL
Sep 14 20:28:26 vipul-Rev-1-0 kernel: [ 234.536693] iwlagn 0000:03:00.0: Error sending REPLY_RXON: enqueue_hcmd failed: -5
Sep 14 20:28:26 vipul-Rev-1-0 kernel: [ 234.536721] iwlagn 0000:03:00.0: Error clearing ASSOC_MSK on BSS (-5)

Reassigning to 'linux'.