Found: Reliable 8kun IP address
So I cycled through all of the 8kun IP addresses to see if one or more of them actually work reliably instead of going dead every so often. The rate of failure ranges from 1/3 to 1/20 though no particular address seems to be more vulnerable than the others and I have no way to determine if geographical location is a factor. The end result is that your 8kun client may lock up occassionally, necessitating a reload.
The only address that is consistently working is this one: 23.163.176.229
That address is not even assigned to 8kun. It is assigned to dailystormer.su which is a Vanwanet client so that's why it works. This is very suspicious. I'm thinking that Vanwanet is deliberately sabotaging 8kun. Or it could be the DDoS protection service which, as far as I know, is still DDoS-Guard (https://ddos-guard.net).