I tried flashing various version of Avalon 2 firmware. the working one is

http://ck.kolivas.org/apps/cgminer/avalon/20131229/

the latest from canaan wont work. it wont start hashing (socket failed). but i can ping/traceroute with no packet loss

what have been done so far.

a) flashing newest firmware, various version firmware - cannot work
b) using stock clock 1300 - cannot work, so I suspect the overclock (1400) issue/ heat is not the problem. after all the temp around 23-26C.
c) connect using wifi disable lan, connect with lan disable the wifi - cannot work

right now using http://ck.kolivas.org/apps/cgminer/avalon/20131229/ firmware. it hash, but I cannot guarantee it will last forever. normally 2-3 days it will stop hashing, but recently it hardly hash for 12 hours.

before this

a) hash for 2-3 days. when it stop hashing, on/off required to resume. soft reboot wont work

now

a) hash for around hours but I able to start hash again with only soft reboot. no need on/off after using

http://ck.kolivas.org/apps/cgminer/avalon/20131229/

I can share using teamviewer if anyone interested to investigate. i read the log but I cannot understand entirely