Having asked a question a year ago about random drop-outs, failure to connect to my music library on a home server, of my Sonos Theatre set-up and not getting any further forward, whether it be by many miscelleneous adjustments or calls to Sonos support, my only conclusion is that I need to switch my Virgin Media Hub 4 into modem mode, and fit a a decent router.
I would appreciate insights from others who have tried this solution to end drop-outs.