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 Version 3.3.7d6
 ====
 **Bug Fixes and Enhancements**
+* Fix a bug calculating the instantaneous synchronisation error. This could occasionally cause Shairport Sync to lose synchronisation and maybe even to mute for a few seconds before regaining it. It was caused by not doing modulo arithmetic properly, and it's been there for a while.
+* Clean up some other uses of modulo arithmetic.
 * Clean up and improve the code to synchronise the first frame of audio. This should result in more accurate and reliable initial synchrnoisation, certainly to under a millisecond in normal usage. Sync should improve even when the silent lead-in time is as short as 0.3 seconds or when the `audio_backend_latency_offset_in_seconds` is as much as -1.7 seconds.
 * Removed a bug which would affect initial synchronisation if a flush command was received from the player at an inopportune time.