Audio dropouts flac files [v17 Krypton] on Fire Stick

OK, have spent days trying to sort this, to no avail.. playing flac files over network results in stuttering at start of playback and intermittent dropouts/pauses in the Audio. To verify is not network issue, have tried various protocols (smb, NAS etc) with no result. Have also eliminated both network and Fire Stick issues by purchasing Vimu Media player, installing on stick, accessing networked files via smb and everything works perfectly, so problem lies within Kodi.
Have also researched in wiki and edited advance configuration xml file, removed addons that may have been draining resources, tried every possible expert setting, but the problem persists. Has anyone any ideas? This is very frustrating as Kodi has a better library and less clunky interface, but at the end of the day will not play the audio consistently, rendering the music player rather useless for streaming high quality audio files, which is unfortunate.

Help/explanation would be greatly appreciated!