After a period of time, the wireless simply stops functioning... NetworkManager 
thinks its still connected.. but no network traffic works.
After a period of time (if left) sometimes it reconnects at G-54Mbit speed.. vs 'N' at around 270Mbit

The following are observed in dmesg:

[  505.669220] iwlwifi 0000:03:00.0: Tx aggregation enabled on ra = 00:04:ed:bb:c6:fd tid = 0
[  555.202192] iwlwifi 0000:03:00.0: Tx aggregation enabled on ra = 00:04:ed:bb:c6:fd tid = 0
[  588.834218] iwlwifi 0000:03:00.0: Tx aggregation enabled on ra = 00:04:ed:bb:c6:fd tid = 0
[  617.740773] iwlwifi 0000:03:00.0: Tx aggregation enabled on ra = 00:04:ed:bb:c6:fd tid = 0
[  690.116581] iwlwifi 0000:03:00.0: Tx aggregation enabled on ra = 00:04:ed:bb:c6:fd tid = 0
[  742.430541] iwlwifi 0000:03:00.0: Tx aggregation enabled on ra = 00:04:ed:bb:c6:fd tid = 0
[  788.704026] iwlwifi 0000:03:00.0: Tx aggregation enabled on ra = 00:04:ed:bb:c6:fd tid = 0
[  801.676020] iwlwifi 0000:03:00.0: Tx aggregation enabled on ra = 00:04:ed:bb:c6:fd tid = 0
[  962.686813] iwlwifi 0000:03:00.0: Tx aggregation enabled on ra = 00:04:ed:bb:c6:fd tid = 0
[ 1015.634260] iwlwifi 0000:03:00.0: Tx aggregation enabled on ra = 00:04:ed:bb:c6:fd tid = 0
[ 1099.420837] iwlwifi 0000:03:00.0: Tx aggregation enabled on ra = 00:04:ed:bb:c6:fd tid = 0
[ 1107.568703] iwlwifi 0000:03:00.0: Tx aggregation enabled on ra = 00:04:ed:bb:c6:fd tid = 0
[ 1119.465765] iwlwifi 0000:03:00.0: Tx aggregation enabled on ra = 00:04:ed:bb:c6:fd tid = 0
[ 1147.984058] iwlwifi 0000:03:00.0: Tx aggregation enabled on ra = 00:04:ed:bb:c6:fd tid = 0
[ 1213.937449] iwlwifi 0000:03:00.0: Tx aggregation enabled on ra = 00:04:ed:bb:c6:fd tid = 0
[ 1239.211977] iwlwifi 0000:03:00.0: Tx aggregation enabled on ra = 00:04:ed:bb:c6:fd tid = 0
[ 1352.128153] iwlwifi 0000:03:00.0: Tx aggregation enabled on ra = 00:04:ed:bb:c6:fd tid = 0
[ 1428.874172] iwlwifi 0000:03:00.0: Tx aggregation enabled on ra = 00:04:ed:bb:c6:fd tid = 0
[ 1467.239910] iwlwifi 0000:03:00.0: Tx aggregation enabled on ra = 00:04:ed:bb:c6:fd tid = 0
[ 1501.816674] iwlwifi 0000:03:00.0: Tx aggregation enabled on ra = 00:04:ed:bb:c6:fd tid = 0
[ 1585.802417] iwlwifi 0000:03:00.0: Tx aggregation enabled on ra = 00:04:ed:bb:c6:fd tid = 0
[ 1638.777505] iwlwifi 0000:03:00.0: Tx aggregation enabled on ra = 00:04:ed:bb:c6:fd tid = 0
[ 1669.836635] iwlwifi 0000:03:00.0: Tx aggregation enabled on ra = 00:04:ed:bb:c6:fd tid = 0
[ 1706.886181] iwlwifi 0000:03:00.0: Tx aggregation enabled on ra = 00:04:ed:bb:c6:fd tid = 0
[ 1733.298790] iwlwifi 0000:03:00.0: Tx aggregation enabled on ra = 00:04:ed:bb:c6:fd tid = 0





Kernel; Linux greenback.local 3.2.2-1.fc16.x86_64 #1 SMP Thu Jan 26 03:21:58 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux






Some details as to the wireless adapter;

[    5.214347] Intel(R) Wireless WiFi Link AGN driver for Linux, in-tree:
[    5.214441] iwlwifi 0000:03:00.0: PCI INT A -> GSI 17 (level, low) -> IRQ 17
[    5.214496] iwlwifi 0000:03:00.0: setting latency timer to 64
[    5.214542] iwlwifi 0000:03:00.0: pci_resource_len = 0x00002000
[    5.214544] iwlwifi 0000:03:00.0: pci_resource_base = ffffc900058a0000
[    5.214545] iwlwifi 0000:03:00.0: HW Revision ID = 0x34
[    5.214830] iwlwifi 0000:03:00.0: irq 50 for MSI/MSI-X
[    5.214919] iwlwifi 0000:03:00.0: CONFIG_IWLWIFI_DEBUG disabled
[    5.214921] iwlwifi 0000:03:00.0: CONFIG_IWLWIFI_DEBUGFS disabled
[    5.214922] iwlwifi 0000:03:00.0: CONFIG_IWLWIFI_DEVICE_TRACING disabled
[    5.214924] iwlwifi 0000:03:00.0: CONFIG_IWLWIFI_DEVICE_TESTMODE disabled
[    5.214925] iwlwifi 0000:03:00.0: CONFIG_IWLWIFI_P2P disabled
[    5.214956] iwlwifi 0000:03:00.0: Detected Intel(R) Centrino(R) Advanced-N 6205 AGN, REV=0xB0
[    5.215034] iwlwifi 0000:03:00.0: L1 Enabled; Disabling L0S
[    5.225137] iwlwifi 0000:03:00.0: device EEPROM VER=0x715, CALIB=0x6
[    5.225140] iwlwifi 0000:03:00.0: Device SKU: 0x1F0
[    5.225142] iwlwifi 0000:03:00.0: Valid Tx ant: 0x3, Valid Rx ant: 0x3
[    5.225166] iwlwifi 0000:03:00.0: Tunable channels: 13 802.11bg, 24 802.11a channels
[    5.241189] iwlwifi 0000:03:00.0: loaded firmware version 17.168.5.3 build 42301
[    9.282736] iwlwifi 0000:03:00.0: L1 Enabled; Disabling L0S
[    9.282928] iwlwifi 0000:03:00.0: Radio type=0x1-0x2-0x0
[    9.565154] iwlwifi 0000:03:00.0: L1 Enabled; Disabling L0S
[    9.565344] iwlwifi 0000:03:00.0: Radio type=0x1-0x2-0x0
[   45.937516] iwlwifi 0000:03:00.0: Tx aggregation enabled on ra = 00:04:ed:bb:c6:fd tid = 6