Network name is not known suddenly by the firewall

Hello,

the failure is shown today again. After changing the settings in the “Domain Name Server”,
(just disable use ISP-Assigned DNS servers")
and press save, the function was working again without reboot.

Can give this an idea what happen?

i found the following logs

5:48:56 unbound: [2852:0] info: [25%]=0.0045186 median[50%]=0.00949129 [75%]=0.0217958
15:48:56 unbound: [2852:0] info: histogram of recursion processing times
15:48:56 unbound: [2852:0] info: average recursion processing time 0.023271 sec
15:48:56 unbound: [2852:0] info: server stats for thread 0: requestlist max 12 avg 0.540796 exceeded 0 jos tled 0
15:48:56 unbound: [2852:0] info: server stats for thread 0: 12592 queries, 9090 answers from cache, 3502 r ecursions, 89 prefetch, 0 rejected by ip ratelimiting
15:48:56 unbound: [2852:0] info: service stopped (unbound 1.13.1).
07:58:20 unbound: [2852:0] info: generate keytag query _ta-4a5c-4f66. NULL IN

by pressing the “save” button, the service was started again.

I check also the file “unbound” because of
this thread : Local DNS problems after update to core 144 - #8 by erikvl
The file has include this patch.

Best regards
R.