Don't know if its related, but, in recent SVN's, after the 3-4 day mark, my KAD always goes firewalled, I have to manually disconnect and reconnect to 're-acquire' a high-ID, it seems to like connecting to a 'buddy' after this period of uptime.
Just gone 3 days uptime, KAD-only.

iptables open chain
Chain open (1 references)
pkts bytes target prot opt in out source destination
24900 1618K ACCEPT tcp -- eth0 * 0.0.0.0/0 0.0.0.0/0 tcp dpt:54662
404K 37M ACCEPT udp -- eth0 * 0.0.0.0/0 0.0.0.0/0 udp dpt:54672
My log is also completely flooded with
2010-01-28 23:40:14: Connected to Kad (firewalled)
2010-01-28 23:40:19: Connected to Kad (ok)
2010-01-29 03:40:17: Connected to Kad (firewalled)
2010-01-29 05:40:16: Connected to Kad (ok)
2010-01-29 06:40:21: Connected to Kad (firewalled)
2010-01-29 06:40:23: Connected to Kad (ok)
2010-01-29 08:40:13: Connected to Kad (firewalled)
2010-01-29 08:40:14: Connected to Kad (ok)
although I think someone said this was normal....?