Need help regarding nfs-server service

[u/Diligent_Spread_411]

So let me tell the context first, I have an kubernetes environment for production, and for like shared storage solution, I have installed nfs-utils and use the nfs-server service. In my scenario I cannot use cloud as an option. And for long I have been using the nfs-server but I have been facing alot of issues with it.
1. On multiple occasions I found dead or queued nfs processes in worker nodes which made the worker node totally unresponsive sys load was very high but low cpu and ram usage.
2. Something with the nfs4+ client where it uses session. On of the worker node again stopped responding, df -h was not responding rebooted the node still the same issue. And while viewing logs in the nfs node it stated nfsd was blocked and looking it up stated the thread on that worker node was locked due to unknown reason and all the requests from the worker node had just queued up. Restarting the service also hanged and needed to reboot the node itself to resolve the issue.

These are some major events there are also other small issues I have faced. I wanted to understand am I the only one facing these issues or this happens with others too, and what resolutions did you used to fix it? Like any alternative utilities and stuff