I just resubbed to the game and I changed my audio settings. Specifically, I raised the BGM from mute and lowered the SFX a bit. Since then, every so often these sounds will mute for a few seconds, with seemingly no pattern as to when it happens. I find it strange that it's only the settings I changed that have this problem; ambience stays normal, for example. Is this a known bug? Any workaround/fix? It's quite annoying.

I should also mention that I was unable to change these settings until I made FFXIV.cfg not read-only in windows. Dunno why it was read-only... the client couldn't stick any settings changes to it until I manually changed this.