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TCP load balancer connection timed out frequently

Using TCP load balancer for several years, while the connection started timed out recently, the successful late is 10-40%, checked by either curl or nc like:

curl https://<our-domain.com>/our/app
curl: (28) Failed to connect to <our-domain.com> port 443 after 16239 ms: Couldn't connect to server
nc -z our-domain.com 443; echo $?
1

Is there any way to add more resources to reduce the timeout, or at least see the log of what is happening on the TCP load balancer?

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