Playback error with Sonos

[user-removed]

Plan

Premium

Country

UK

Device

(iPhone 7 plus)

Operating System

(iOS 10.)

for the last two days I have been having playback issues when connecting to Sonos speakers. I keep losing the connection to all my Sonos speakers. The sync drops off and I then can’t adjust volume etc or change song. All works fine if I use Sonos app. Sonos have run diagnostics and have said that Spotify is reaching streaming limit and dropping connection. What is going on?