Spotify won’t work on home wifi on firestick

[Amanda70]

Plan

Premium

Country

UK

Device

Firestick

Operating System

(iOS 10, Android Oreo, Windows 10,etc.)

My Question or Issue

Spotify will load in my firestick but won’t play anything - either just holds or skips songs very quickly. 3-4 secs plays with no volume then skips to next. Tried reinstalling, logging off, powering off firestick etc but the only thing that stops this is swapping firestick to use mobile hotspot rather than home wifi network. Seems to play fine then.

Spotify on phone works on home wifi and works on laptop using home wifi. Amazon music and bbc sounds work fine on firestick with home wifi. No other streaming issues with home wifi. 
Any ideas how I can remedy this. I don’t want to hotspot my mobile every time