My NL 920 have this annoying bug after it got updated to WP8.1 dev Preview, the Headset will occasionally have its right side goes silent (only the left one works) and only can be mended by restarting it... It only happens on cabled Headphones (have tried many and all happens the same)... Bluetooth ones not effected. And always been like this each time. Is there anyone having the same problem? And is there a fix for it in Cyan maybe??? It's very annoying.