dns query over 3 seconds

Hi Support,

recently  we have an dns query slow issue.

according our test some times query will be over 3 seconds, could you help us to resolve this issue? Many thanks

 1368 ;; From 37.252.243.39@853(TCP) in 44.4 ms
 1369 ;; Time 2024-01-08 23:27:29 CST
 1370 ;; From 45.150.242.161@853(TCP) in 2.6 ms
 1371 ;; Time 2024-01-08 23:27:30 CST
 1372 ;; From 45.150.242.161@853(TCP) in 3004.0 ms
 1373 ;; Time 2024-01-08 23:27:35 CST
 1374 ;; From 45.150.242.161@853(TCP) in 1.6 ms
 1375 ;; Time 2024-01-08 23:27:36 CST

My test scripts

kdig -d +tls-ca +tls-host=bd7225.dns.nextdns.io @bd7225.dns.nextdns.io kkbox.com | grep 'Time' -A 2 >> dns_log.txt