crwdns2933897:0crwdne2933897:0

The sound doesn't sometimes work

I have a headset for a five months now, loved it, gave me good sound. But now I have flick the volume box to get proper sound, how do I fix it? I really like these headphones and I'm pretty sure it's the volume box.

http://www.google.com/search?q=logitech+...

For example))

crwdns2934089:0crwdne2934089:0 crwdns2934093:0crwdne2934093:0

crwdns2934109:0crwdne2934109:0

crwdns2853045:0crwdne2853045:0 crwdns2853046:0crwdne2853046:0
crwdns2889612:0crwdne2889612:0 3
crwdns2934285:0crwdne2934285:0