Spotify plug-in 3.0.1 & connect2 3.0.8

My volumio runs on a tinkerboard and volumio itself never seems to cause any problems. However my Spotify appears to ‘disconnect’. This seems to happen when I have not used Spotify for a while (never while its in use). I open VolumeIO, then on the interface, select Spotify (the plug-in) and nothing appears. If I try to use spotify on my phone, spotify is fine but when trying to connect to Volumio, it never connects (but will play on the phone). If I re-boot the Tinkerbaord (Volumio) then both Spotify on my phone and the plugin via the volumio interface work without problems.
Can anyone shed any light, perhaps its some authentication issue. Perhaps my router is blocking something?
Many thanks