Your mention of an 'old low performance NAS' and '2 different NAS drives' makes me wonder if this is a standard USB drive connected to a port on your router (rather than a 'proper' NAS)? Also, is the network connection wired or WiFi?
The older NAS I am using is a D-Link ShareCenter which is connected by network cable to a Vigor 2860 Router. I am accessing the NAS by WiFi from the Cyclone.
The other NAS is a Synology DS215j which is connected in the same way.