this is everything, have reinstalled at 15:30 Logtime, (17:30 real time / the timezone was corrected at ca 17:47, and there is no gap)
no older Logs are avaliable. but I think there was the same error.
[root@ipfire1 ~]# grep --color -e "Exiting due to repeated, frequent failures" -e "service stopped" /var/log/messages
Sep 20 15:34:08 ipfire1 unbound: [4596:0] info: service stopped (unbound 1.17.1).
Sep 20 15:34:13 ipfire1 unbound: [7397:0] info: service stopped (unbound 1.17.1).
Sep 20 15:35:45 ipfire1 unbound: [7397:0] info: service stopped (unbound 1.17.1).
Sep 20 15:37:08 ipfire1 unbound: [7397:0] info: service stopped (unbound 1.17.1).
Sep 20 15:37:49 ipfire1 unbound: [7397:0] info: service stopped (unbound 1.17.1).
Sep 20 15:38:12 ipfire1 unbound: [7397:0] info: service stopped (unbound 1.17.1).
Sep 20 15:39:35 ipfire1 unbound: [7397:0] info: service stopped (unbound 1.17.1).
Sep 20 15:40:50 ipfire1 unbound: [4710:0] info: service stopped (unbound 1.17.1).
Sep 20 15:40:55 ipfire1 unbound: [4710:0] info: service stopped (unbound 1.17.1).
Sep 20 15:42:07 ipfire1 unbound: [4710:0] info: service stopped (unbound 1.17.1).
Sep 20 15:42:49 ipfire1 squid[8167]: Exiting due to repeated, frequent failures
Sep 20 15:46:54 ipfire1 unbound: [4710:0] info: service stopped (unbound 1.17.1).
Sep 20 17:48:17 ipfire1 unbound: [4710:0] info: service stopped (unbound 1.17.1).
Sep 20 17:48:28 ipfire1 unbound: [4710:0] info: service stopped (unbound 1.17.1).
Sep 20 17:48:33 ipfire1 unbound: [4710:0] info: service stopped (unbound 1.17.1).
Sep 20 17:50:15 ipfire1 unbound: [4710:0] info: service stopped (unbound 1.17.1).
Sep 20 17:56:38 ipfire1 unbound: [4710:0] info: service stopped (unbound 1.17.1).
Sep 20 17:59:07 ipfire1 unbound: [4710:0] info: service stopped (unbound 1.17.1).
Sep 20 18:01:42 ipfire1 unbound: [4710:0] info: service stopped (unbound 1.17.1).
Sep 20 18:07:24 ipfire1 unbound: [4710:0] info: service stopped (unbound 1.17.1).
Sep 20 18:07:47 ipfire1 unbound: [4710:0] info: service stopped (unbound 1.17.1).
Sep 20 18:12:05 ipfire1 unbound: [4710:0] info: service stopped (unbound 1.17.1).
Sep 20 18:16:52 ipfire1 unbound: [4710:0] info: service stopped (unbound 1.17.1).
Sep 20 18:18:15 ipfire1 unbound: [4710:0] info: service stopped (unbound 1.17.1).
Sep 20 18:20:14 ipfire1 unbound: [4710:0] info: service stopped (unbound 1.17.1).
Sep 20 18:26:38 ipfire1 unbound: [4710:0] info: service stopped (unbound 1.17.1).
Sep 20 18:37:38 ipfire1 unbound: [4710:0] info: service stopped (unbound 1.17.1).
Sep 20 18:37:49 ipfire1 unbound: [4710:0] info: service stopped (unbound 1.17.1).
Sep 20 18:42:06 ipfire1 unbound: [4710:0] info: service stopped (unbound 1.17.1).
Sep 20 18:42:49 ipfire1 squid[9486]: Exiting due to repeated, frequent failures
Sep 20 18:48:17 ipfire1 unbound: [4710:0] info: service stopped (unbound 1.17.1).
Sep 20 18:50:11 ipfire1 unbound: [4710:0] info: service stopped (unbound 1.17.1).
Sep 20 18:56:34 ipfire1 unbound: [4710:0] info: service stopped (unbound 1.17.1).
Sep 20 19:01:46 ipfire1 unbound: [4710:0] info: service stopped (unbound 1.17.1).
Sep 20 19:07:51 ipfire1 unbound: [4710:0] info: service stopped (unbound 1.17.1).
Sep 20 19:12:09 ipfire1 unbound: [4710:0] info: service stopped (unbound 1.17.1).
Sep 20 19:16:56 ipfire1 unbound: [4710:0] info: service stopped (unbound 1.17.1).
Sep 20 19:18:14 ipfire1 unbound: [4710:0] info: service stopped (unbound 1.17.1).
Sep 20 19:20:13 ipfire1 unbound: [4710:0] info: service stopped (unbound 1.17.1).
Sep 20 19:23:36 ipfire1 unbound: [4710:0] info: service stopped (unbound 1.17.1).
Sep 20 19:26:36 ipfire1 unbound: [4710:0] info: service stopped (unbound 1.17.1).
Sep 20 19:37:47 ipfire1 unbound: [4710:0] info: service stopped (unbound 1.17.1).
Sep 20 19:38:04 ipfire1 unbound: [4710:0] info: service stopped (unbound 1.17.1).
Sep 20 19:42:10 ipfire1 unbound: [4710:0] info: service stopped (unbound 1.17.1).
Sep 20 19:42:49 ipfire1 squid[29658]: Exiting due to repeated, frequent failures
Sep 20 19:48:15 ipfire1 unbound: [4710:0] info: service stopped (unbound 1.17.1).
Sep 20 19:48:32 ipfire1 unbound: [4710:0] info: service stopped (unbound 1.17.1).
Sep 20 19:50:14 ipfire1 unbound: [4710:0] info: service stopped (unbound 1.17.1).
Sep 20 19:56:37 ipfire1 unbound: [4710:0] info: service stopped (unbound 1.17.1).
Sep 20 20:07:49 ipfire1 unbound: [4710:0] info: service stopped (unbound 1.17.1).
Sep 20 20:08:24 ipfire1 unbound: [4710:0] info: service stopped (unbound 1.17.1).
Sep 20 20:12:05 ipfire1 unbound: [4710:0] info: service stopped (unbound 1.17.1).
Sep 20 20:18:17 ipfire1 unbound: [4710:0] info: service stopped (unbound 1.17.1).
Sep 20 20:20:16 ipfire1 unbound: [4710:0] info: service stopped (unbound 1.17.1).
Sep 20 20:26:39 ipfire1 unbound: [4710:0] info: service stopped (unbound 1.17.1).
Sep 20 20:28:08 ipfire1 unbound: [4710:0] info: service stopped (unbound 1.17.1).
Sep 20 20:37:50 ipfire1 unbound: [4710:0] info: service stopped (unbound 1.17.1).
Sep 20 20:38:37 ipfire1 unbound: [4710:0] info: service stopped (unbound 1.17.1).
Sep 20 20:42:06 ipfire1 unbound: [4710:0] info: service stopped (unbound 1.17.1).
Sep 20 20:42:49 ipfire1 squid[6800]: Exiting due to repeated, frequent failures
Sep 20 20:48:18 ipfire1 unbound: [4710:0] info: service stopped (unbound 1.17.1).
Sep 20 20:50:11 ipfire1 unbound: [4710:0] info: service stopped (unbound 1.17.1).
Sep 20 20:56:34 ipfire1 unbound: [4710:0] info: service stopped (unbound 1.17.1).