Spotty Extreme quality (320kbps) does not work seamlessly

Thanks, Michael Herger for such a wonderful plugin. I a newbie to Squeezebox and Spotty. After installing Spotty, it works fantastic upto high (160kbsp) quality. When I set extreme quality (320kbps) it struggles to play and for every few seconds it stops and play again in a few seconds. This is only for extreme quality. My Spotify account is Premium. Where as Tidal plugin works fine with hifi quality consuming higher bandwidth than 320kbps - this is just to ensure that network is not an issue. On same network I am able to seamlessly play Spotify extreme quality on all other devices at home.

HW: RPi3B+ Wifi + FX Audio DAC X6
SW: piCorePlayer v6.1.0 | www v0009 | linux 4.19.122-pcpCore_v7 | piCore v10.3pCP | Squeezelite v1.9.6-1206-pCP | LMS v8.0.0
Spotty: v4.2.0 (none of Spotty Helper plugin installed - I believe it is not necessary. Please correct me if I am wrong. I tried installing, it does not make any difference)

Any suggestions?