BTW if this is in the wrong section feel free to move it please

I searched and couldn't find a topic with my problem solved. I was able to successfully crack my own wifi wep once but was unable to do it again the second time...and I have no idea why, i followed these steps
this -->points to problem

airmon-ng stop ath0
airmon-ng start wifi0
airodump-ng ath0
aireodump-ng -c 6--bssid the mac -w output ath0
aireplay-ng -1 0 -e name -a mac -h cardmac ath0 --> Continues to send authentication and such without the smiley thing.
when it finally works...

aireplay-ng -4 -b mac -h cardmac ath0-->continues getting packets w/o ARP requests comin in...
when it does work somehow

aircrack-ng -b mac output*.cap
the ivs stop rising and freeze at 150000 and it doesnt crack the wep.

I would like to know if I am doing anything wrong at all. I was thinking maybe the first time was some sort of fluke or something....

I'm using LIVE CD btw