Controlling Bluesound Node 2 - problem using Samsung devices.

I am a new to Bluesound user - so I may use incorrect terms :-)

I purchased a Node 2 and got it up and running reasonably quickly - but it was very quirky and slow to display songs/artists/albums/etc..

I’ve since got it stabilized and opertaing nicely, BUT
- I can only use my old Motorola phone, or an old Asus tablet .
- I can also use either my Windows or Imac BlueOS Interfaces.

However, I own a new Samsung phone and tablet and neither of those units work for some reason

The issue: both Samsungs see the node 2, but do not appear to see content on my NAS drive

The NAS drive is visible and accessible using file manager-type programs on the Samsungs and all other devices - just not using the BlueOS App

I have read of "network issues" with Samsung products and was wondering if any members has experienced similar issues and how they overcame them.

Hardware Setup:
- All "controlling devices" connect via wireless to my router/modem
- the NAS drive is connected to the same router/model directly via ethernet cable
- BlueOS Controller App version 2.8.3

I have tried several solutions offered by the Bluesound Support without success

Any help would be greatly appreciated - thanks