Problems with Mesh Wi-Fi?

Sorry if this has been covered - couldn't find it with a quick search so
just point me at the thread please.

I just replaced my "normal" 4G modem/router + wi-fi range extender with
a 5-station TP-Link Deco X20 mesh system to get better signal strength
throughout the house.  And indeed I have - my various Squeeze devices
report better signal strength all round.  However, I'm now getting
terrible rebuffering - 5 second gaps every 30 seconds of music -
especially with FLAC files played from my iMac.  Lower-res files (e.g.
320K MP3) cause slightly less problems but still noticeable.  Network is
optimised according to Deco App and inSSIDer scan looks good. 
Everything rebooted.  I do use SmartDNS but that shouldn't affect local
playback should it?
Anyone else had the same problems?  Any ideas?

Thanks



-Seen it all, done it all, can't remember most of it ...-
Server = iMac -> Bootcamp ->  W10 (dBpoweramp ripping / MediaMonkey
management)
Router = Huawei B535 LTE 4G + Linkysys Deco X20 mesh x 5
Lounge = SBT -> Devialet D200 -> Dynaudio Contour 1.8 MkII
Covered terrace = SBT -> AudioEngine A5+
Kitchen + bedroom = SB Radio
Garage = SB2 -> Rotel RA820BX2 -> MA252
Storage = SB3 + SlimP3 
iOS control = iPeng / SqueezePad; Android = SqueezeCommander;
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