The IP address of solo.ckpool.org changes after a DDoS and perhaps these devices almost never look up the IP address using a cached result for ages. In which case a restart might be required, either of cgminer or the whole device.
I have restarted the whole device 3 times (one of those was power off for 20+ minutes) and it still is in failover, I'll see if I can't flush its dns cache or something, thanks.