Connections in "Writing" state grows over time

I am seeing following on one of our nginx servers:

Active connections: 104
server accepts handled requests
1319784 1319784 1641260
Reading: 0 Writing: 98 Waiting: 6

Connections in “Writing” states keep on piling up as the time goes by
until restart, has anybody else seen this situation and tried to solve?

Thanks,
Abhinav