After having streaming dropouts for a week or two I checked out the Sonos page on incompatible hardware and found my recently purchased and installed gigabit switch was incompatible. I plugged my Boost back into the router rather than the switch and all perfect now.
Audio streaming intermittent drop out - Netgear GS108 Gigabit Switch looks to be the cause
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Netgear, I believe, released a later version 3 of that gigabit switch, which I seem to recall was possibly compatible, or it worked for some users, so the GS108 buildversion maybe worth checking.
Thanks Ken. Just looked at my switch and its a GS108v4. It worked fine all the time playing from the Music Library but struggled with internet radio.
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