RUTX50 Mesh Network - Configuration / traffic Issues

@TomasV following on from the update above everything seems to be fine on 2.4ghz and on my phone I can see access point roaming working. I have just now done the same for 5ghz and get massive packet loss 50-100%. I turn on 5ghz on RUTX50 and mesh and all is ok but if I then switch on 5ghz on either RUTX10 node I then get massive packet loss and no access to internet. I have set a specific channel the same on all 3 devices and the 5ghz SSID is appended with a ‘-5’ and the mesh name ‘mesh5’ is different to the 2.4ghz ‘mesh24’. Any ideas what I should look for?