@Kevin_Z Sorry for the delay in replying but I have had other things to occupy my mind. Yes the HDD keeps losing the connection via the router and disappears off the network. This happens when using...

I have connected a Seagate 16Tb mains powered HDD to the USB 3 port on my router (yes using a USB 3 cable). The Seagate is formatted in NTFS. All works well for a few minutes until without warning...