NFS 4 hang issue in kernal 3.10.0.357.e17

Hi, I am facing issues in server RHEL 7.6. It always hangs on df -h on NFS client-server.
When I reboot it will resolve the issue but next day same issue.
How to resolve it permanently.

Thanks in advance

error message is

Dec 18 15:31:11 Yamuna kernel: [] nfs4_state_manager+0x5fd/0x8d0 [nfsv4]
Dec 18 15:31:11 Yamuna kernel: [] ? nfs4_state_manager+0x8d0/0x8d0 [nfsv4 ]
Dec 18 15:31:11 Yamuna kernel: [] nfs4_run_state_manager+0x1f/0x40 [nfsv4 ]
Dec 18 15:31:11 Yamuna kernel: [] kthread+0xd1/0xe0
Dec 18 15:31:11 Yamuna kernel: [] ? insert_kthread_work+0x40/0x40
Dec 18 15:31:11 Yamuna kernel: [] ret_from_fork_nospec_begin+0x7/0x21
Dec 18 15:31:11 Yamuna kernel: [] ? insert_kthread_work+0x40/0x40