Sysupgrade - no wireless after upgrade

After installing snapshot on each occasion the wireless is not associated and a reboot is required before wireless works. Note i have kept my settings during sysupgrade.

Is this normal operation ?

Model : Netgear DGN3500
Architecture : AR9 rev 1.2
Firmware Version : OpenWrt SNAPSHOT r7466-6719991 1

First Boot dmesg:

[  147.486077] PCI: Enabling device 0000:00:0e.0 (0000 -> 0002)
[  147.536871] ath: EEPROM regdomain: 0x0
[  147.539231] ath: EEPROM indicates default country code should be used
[  147.545610] ath: doing EEPROM country->regdmn map search
[  147.550875] ath: country maps to regdmn code: 0x3a
[  147.555610] ath: Country alpha2 being used: US
[  147.560014] ath: Regpair used: 0x3a
[  147.579627] ieee80211 phy0: Selected rate control algorithm 'minstrel_ht'
[  147.590828] ieee80211 phy0: Atheros AR9280 Rev:2 mem=0xb8000000, irq=30
[  180.700092] [DSL_BSP_Showtime 914]: Datarate US intl = 1020958, fast = 0
[  180.705463] enter showtime, cell rate: 0 - 2407, 1 - 2407, xdata addr: 0x82d20000
[  187.289775] pppoe-wan: renamed from ppp0

After reboot dmesg

[   15.674359] PCI: Enabling device 0000:00:0e.0 (0000 -> 0002)
[   15.727052] ath: EEPROM regdomain: 0x0
[   15.729347] ath: EEPROM indicates default country code should be used
[   15.735777] ath: doing EEPROM country->regdmn map search
[   15.741040] ath: country maps to regdmn code: 0x3a
[   15.745777] ath: Country alpha2 being used: US
[   15.750182] ath: Regpair used: 0x3a
[   15.769732] ieee80211 phy0: Selected rate control algorithm 'minstrel_ht'
[   15.780455] ieee80211 phy0: Atheros AR9280 Rev:2 mem=0xb8000000, irq=30
[   22.902739] rtl8366rb rtl8366rb: applying initvals from DTS
[   30.957374] br-lan: port 1(eth0.1) entered blocking state
[   30.961411] br-lan: port 1(eth0.1) entered disabled state
[   30.967290] device eth0.1 entered promiscuous mode
[   30.971522] device eth0 entered promiscuous mode
[   31.009433] br-lan: port 1(eth0.1) entered blocking state
[   31.013459] br-lan: port 1(eth0.1) entered forwarding state
[   31.019271] IPv6: ADDRCONF(NETDEV_UP): br-lan: link is not ready
[   31.939181] IPv6: ADDRCONF(NETDEV_CHANGE): br-lan: link becomes ready
[   34.536926] ath: EEPROM regdomain: 0x8024
[   34.539563] ath: EEPROM indicates we should expect a country code
[   34.545567] ath: doing EEPROM country->regdmn map search
[   34.550827] ath: country maps to regdmn code: 0x21
[   34.555576] ath: Country alpha2 being used: AU
[   34.559981] ath: Regpair used: 0x21
[   34.563441] ath: regdomain 0x8024 dynamically updated by user
[   39.979613] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
[   40.052875] br-lan: port 2(wlan0) entered blocking state
[   40.056875] br-lan: port 2(wlan0) entered disabled state
[   40.062678] device wlan0 entered promiscuous mode
[   50.297631] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
[   50.302960] br-lan: port 2(wlan0) entered blocking state
[   50.307883] br-lan: port 2(wlan0) entered forwarding state
[   59.422787] ATM1.0.26    ATM (A1) firmware version 0.16
[   59.426551] ifxmips_atm: ATM init succeed
[   94.139044] [DSL_BSP_Showtime 914]: Datarate US intl = 1020958, fast = 0
[   94.144433] enter showtime, cell rate: 0 - 2407, 1 - 2407, xdata addr: 0x82e60000
[   95.860030] pppoe-wan: renamed from ppp0

/etc/config/wireless:

config wifi-device 'radio0'
	option type 'mac80211'
	option path 'pci0000:00/0000:00:0e.0'
	option country 'AU'
	option channel 'auto'
	option hwmode '11g'
	option htmode 'HT20'
	option legacy_rates '0'