My DNS server used bind 9.3.2 ,recently DNS server failes,I used rndc
status ,appear below:
recursive clients: 35251/80000,but DNS server run well,recursive clients:
6501/80000.When DNS server failed,I resolved local zone is ok,but resolved
outside zone is server-fail.First,My server had 32G RAM and cpu idle is
80%,RAM user is 13%,the server resoure is enough.But why ,I don't know.I
wish somebody could help me, it is so luckly.

it is my named.conf below:
allow-transfer { none; };
notify no;
recursion yes;
recursive-clients 80000;
query-source address * port 53;
tcp-clients 1000;
max-cache-ttl 43200;
cleaning-interval 120;
datasize unlimited;
listen-on-v6 { none; };
auth-nxdomain no;

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