Very slow transfer speed (only to private space) - My Cloud Home

I have been so close to returning my mycloud home, but i have found I am getting sync speeds of 120mbps now which I am happy with. It is syncing the way i want it. The only thing im finding now is occasionally when i come to update a folder or sync it, everything turns to the blue sync light… But nothing. To actually have it sync properly I have to unplug my ethernet cable from drive for a minute of two, then plug it in the transfers fires up. I know everybody is saying just take it back, but this is almost what i was expecting from it, but why do i have to disconnect then reconnect for it to trigger a proper sync???