Lots of people reporting hearing loud static noises in-game this evening.
Seems to be associated with multiple events: random kindness, firefly jars, teleporting, changing streets.
Also seemed to be consistent... if it happened once then it would happen again. Except I was hearing it consistently with random kindness and I adjusted my sound sliders to identify which channel it was coming in on... and I haven't heard it again since.
Some people reporting it on the music channel, some on the effects channel. Only clue we've got so far is that two of us have reported that moving the sound sliders stops it.
Everyone that stated a browser was using Chrome... not sure if that's a valid lead.
Staff edit: This issue is now fixed. Sorry about that!