No DNS query when accessing SMB share.

Hello,

The problem we encounterd is as follows. 

We have a 6 node cluster with a pool of 10 IP addresses dedicated to SMB sharing.

When I try to reach share from client via smart connect name it is ok. BUT, no IP rotation occurs. Every new connection goes to same IP address, thus causing one node overloading. At first I thought SmartConnect wasn't working. But, when I try to ping SC name, it always gives different addressed, i.e. it's working (delegation in DNS configured, SC policy is round robin). 

I tried to see queries to DNS in wireshark, there are no queries when I connect to share via SC name. There are queries when I'm pinging SC name. Checked hosts file, flushed dns - no use. Has anyone encountered this problem?