If you have a support contract I would suggest opening a case for this.
What prompted you to check those values? Looks like those are allocations within nblade, and you aren't hitting any limits from what I can see.
Do you have any more context on the issue itself? Multiple users? Multiple shares? Intermittent or constant? Does it self resolve on its own? Any detectable pattern? What NFS version?
Also I linked the wrong KB in my last response. Meant to do this one, which you might be affected by. See the RedHat KB as well.
https://kb.netapp.com/Advice_and_Troubleshooting/Data_Storage_Software/ONTAP_OS/NFS_Server_server-name_not_responding%2C_still_trying_in_RHEL_7.6
https://access.redhat.com/solutions/3765711
Addings LIFs will likely not help since you're only mounting to one single LIF/IP.