problem connection to WPA network

[Matt and Irina]

I have a linux system that is often (but not always) unable to connect to my secured WPA (personal) network. ?Does the following log file give a clue as to what would be the problem in the negotiation?

Log file:
Information about this interface: Interface: wlan0  Driver: rt73usb  Bus: usb  MacAddress: 00:1F:1F:42:A1:29 Description: Ralink RT73 USB Wireless LAN driver.  STEP1a: ifconfig wlan0 up
STEP1b: iwlist wlan0 scan
wlan0     Scan completed : Cell 01 - Address: 74:9D:DC:15:99:59 Channel:9 Frequency:2.452 GHz (Channel 9) Quality=46/70  Signal level=-64 dBm   Encryption key:on ESSID:"2135" Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 6 Mb/s; 9 Mb/s 11 Mb/s; 12 Mb/s; 18 Mb/s Bit Rates:24 Mb/s; 36 Mb/s; 48 Mb/s; 54 Mb/s Mode:Master Extra:tsf=00000110f6bcd235 Extra: Last beacon: 224ms ago IE: Unknown: 000432313335 IE: Unknown: 010882848B0C12961824 IE: Unknown: 030109 IE: Unknown: 0706555320010B1B IE: IEEE 802.11i/WPA2 Version 1 Group Cipher : TKIP Pairwise Ciphers (2) : CCMP TKIP Authentication Suites (1) : PSK IE: WPA Version 1 Group Cipher : TKIP Pairwise Ciphers (2) : CCMP TKIP Authentication Suites (1) : PSK IE: Unknown: 2A0100 IE: Unknown: 32043048606C
STEP1c: ifconfig wlan0 down
STEP2: iwconfig wlan0 mode managed
STEP3: iwconfig wlan0 channel 9
STEP4: iwconfig wlan0 essid "2135"
STEP5a: ifconfig wlan0 up
STEP5b: wpa_supplicant -B -Dwext -iwlan0 -c"/etc/simple_network_setup/wpa_supplicant.conf-2135-00:1F:1F:42:A1:29"
STEP6a: dhcpcd  wlan0
Error, wlan0: timed out
Warning, wlan0: using IPV4LL address 169.254.6.74
STEP6b: dhcpcd -I '' wlan0
Error, wlan0: timed out
Warning, wlan0: using IPV4LL address 169.254.6.74 *********************************************************
LAST 10 LINES of /var/log/messages:
Dec  6 22:38:04 puppypc local0.info dhcpcd[14890]: wlan0: received NAK: (null)
Dec  6 22:38:08 puppypc local0.info dhcpcd[14890]: wlan0: offered 192.168.1.94 from 192.168.1.254
Dec  6 22:38:08 puppypc local0.info dhcpcd[14890]: wlan0: received NAK: (null)
Dec  6 22:38:09 puppypc local0.info dhcpcd[14890]: wlan0: offered 192.168.1.95 from 192.168.1.254
Dec  8 03:38:12 puppypc user.debug kernel: wlan0: deauthenticating from 74:9d:dc:15:99:59 by local choice (reason=3)
Dec  6 22:38:12 puppypc local0.err dhcpcd[14890]: wlan0: read: Network is down
Dec  6 22:38:12 puppypc local0.info dhcpcd[15203]: wlan0: sending signal 1 to pid 14890
Dec  6 22:38:12 puppypc local0.err dhcpcd[14890]: wlan0: sendto: Network is down
Dec  6 22:38:12 puppypc local0.info dhcpcd[14890]: wlan0: removing IP address 169.254.6.74/16
Dec  6 22:38:12 puppypc local0.info dhcpcd[14890]: wlan0: exiting
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