I have been using Shield Pro as well from a year and I regularly play files in range of 60+ GB with Kodi + Real-Debrid using Ezra extension. Never got any hicupps unless some sources are too slow to play. Offlate i observed that sometime during pause or when shield goes to sleep it looses Audio handshake (For lack of better term) due to which Audio changes to DD Surround rather than Atmos/TDHD.. In that case only option is to restart the Shield.