@TBCS Are all the Yogas in a specific part of your network (one switch/room/subnet)? It’s kind of unlikely this is caused by the Yogas being UEFI systems. What could be the case is that the network driver for the NIC used (probably an external adapter, right?) is kind of buggy and not allowing for a proper NFS connection. But as we check network connection on bootup it’s also very unlikely.
I guess George is on the right track here. Your network seems to not handle the default 0.7 second timeout well and therefore you see random failures. Try manual mounting as George suggested a couple of times in a row to see how often it fails.
mkdir /testfs
mount -o nolock,proto=tcp,rsize=32768,intr,noatime 10.10.1.93:/images /testfs
umount /testfs
mount -o nolock,proto=tcp,rsize=32768,intr,noatime 10.10.1.93:/images /testfs
umount /testfs
...
Then add the timeout option as well and see if it’s doing any better.
mount -o timeo=10,nolock,proto=tcp,rsize=32768,intr,noatime 10.10.1.93:/images /testfs
umount /testfs
mount -o timeo=20,nolock,proto=tcp,rsize=32768,intr,noatime 10.10.1.93:/images /testfs
umount /testfs
...