PAM node is generating numerous of notifications that network store is up then down. During this time when the network storage button is refreshed it will be available, then unavailable.
PAM 4.1.2.X
RHEL 8
NFS 2.3.3-59
We see this type of issues generally when the NFS server is overloaded and randomly taking time to serve the requests from PAM.
NFS server admin can change the nfs.conf by increasing the number of threads:
/etc/nfs.conf
[nfsd]
threads=8
Change to: threads=16
To bring the configuration changes into effect the NFS service needs to be restarted:
systemctl restart nfs-server.service