I had problems with my Ci20 board where it would freeze (deadlock) randomly when wifi interface was left UP (however no wifi connection was established - I do not use wifi, only the ethernet interface).
I troubleshooted this for a long time, at the end disabling wifi did make the board stable - I just disabled the interface using nmcli so it won't be brought back after a reboot - now everything works correctly.
I wasn't able to connect HDMI and get a signal when the board was locked up - LED was still red, but I generally don't get any HDMI signal out of the board - as mentioned in my other topic.
Power supply is 5V / 3A, and I tried different power supplies just to be sure.
It's not a showstopper for me, I was just wondering if anybody else has the same issue and if it is a known issue / if there are any solutions for it.
I am running latest fully updated debian 8 beta nand.